Events

March 17-18, 2024 Symposium of the Spintronics Research Network of Japan, 8th Annual Meeting of the Spintronics Research Network of Japan will be held in Katahira Campus at Tohoku University.
https://www.csrn.tohoku.ac.jp/meeting.html
Organized by CSRN and Spin-RNJ
March 16-17, 2024 The 27th Symposium on the Physics and Applications of Spin-related Phenomena in Semiconductors was held in Katahira Campus at Tohoku University.
https://kohdalab-material-tohoku.jp/pasps-27/
Co-organized by CSRN and Spin-RNJ
February 19-23, 2024 44th Computational Materials Design (CMD®) Workshop – Spring 2024 Live! Online was held as an online virtual meeting.
https://cmdworkshop.sakura.ne.jp/index_eng.html
Organized by CSRN and Spin-RNJ
December 2-3, 2023 Vietnam Academic Network in Japan Conference 2023 (VANJ 2023) – Green Environment and Energy – was held in Hongo Campus at the University of Tokyo.
http://conf.vanj.jp/2023
Co-organized by CSRN and Spin-RNJ
November 6-7, 2023 Seminar on “Introduction to Spintronics” was held in Yagami Campus at Keio University.
Organized by Spintronics Society of JSAP, Co-organized by CSRN and Spin-RNJ
September 4-8, 2023 43rd Computational Materials Design (CMD®) Workshop – Autumn 2023 Live! Online was held as an online virtual meeting.
https://cmdworkshop.sakura.ne.jp/index_eng.html
Organized by CSRN and Spin-RNJ
August 7-10, 2023 Spintronics and Quantum Transformation (Spin-QX 2023) was held at Forschungszentrum Jülich, Peter Grünberg Institute, Germany.
https://www.fz-juelich.de/en/pgi/pgi-1/expertise/spintronics-and-quantum-transformation-spin-qx-2023
photo
Co-organized by Forschungszentrum Jülich, Peter Grünberg Institute and CSRN and Spin-RNJ
March 20-21, 2023 Symposium of the Spintronics Research Network of Japan, 7th Annual Meeting of the Spintronics Research Network of Japan was held in Uji Campus at Kyoto University.
https://www.scl.kyoto-u.ac.jp/~csrn/spinRNJSympo2022.html
Organized by CSRN and Spin-RNJ
February 20-24, 2023 42nd Computational Materials Design (CMD®) Workshop – Spring 2023 Live! Online was held as an online virtual meeting.
https://cmdworkshop.sakura.ne.jp/index_eng.html
Organized by CSRN and Spin-RNJ
January 28, 2023 16th Meeting on “Ferroic-ordering and their manipulation” was held as a hybrid meeting (Takeda Hall on the Hongo/Asano Campus of the University of Tokyo).
http://annex.jsap.or.jp/ferroic/en/
Co-organized by CSRN and Spin-RNJ
December 19, 2022 Symposium on “Quantum Technology and Semiconductors Open up The Future Society” was held in Komaba Research Campus at the University of Tokyo.
http://www.nanoquine.iis.u-tokyo.ac.jp/symposium-2022-12-19
JointSymposium_2022flyer
Jointly organized by NanoQuine, d.lab and CSRN
November 26-27, 2022 Vietnam Academic Network in Japan Conference 2022 (VANJ 2022) – Diversity for an Inclusive Society – was held in hybrid conference (The University of Tokyo).
http://conf.vanj.jp/2022
Co-organized by CSRN and Spin-RNJ
November 17-18, 2022 Seminar on “Introduction to Spintronics” was held as an online virtual meeting.
Organized by Spintronics Society of JSAP, Co-organized by CSRN and Spin-RNJ
September 5-9, 2022 41th Computational Materials Design (CMD®) Workshop – Autumn 2022 Live! Online was held as an online virtual meeting.
https://cmdworkshop.sakura.ne.jp/index_eng.html
Organized by CSRN and Spin-RNJ
July, 10-15, 2022 24th International Colloquium on Magnetic Films and Surfaces (ICMFS-2022) was held as a hybrid conference (Okinawa Institute of Science and Technology Graduate University).
https://www.scl.kyoto-u.ac.jp/~csrn/external/icmfs2022/index.html
Organized by CSRN and Spin-RNJ
March 29-30, 2022 Seminar on “Introduction to Spintronics” was held as an online virtual meeting.
Organized by Spintronics Society of JSAP, Co-organized by CSRN and Spin-RNJ
March 10, 2022 Symposium of the Spintronics Research Network of Japan, 6th Annual Meeting of the Spintronics Research Network of Japan was held as an online virtual meeting.
http://www.csrn.t.u-tokyo.ac.jp/spin-rnj-symposium2021/
Organized by CSRN and Spin-RNJ
February 21-25, 2022 40th Computational Materials Design (CMD®) Workshop – Spring 2022 Live! Online was held as an online virtual meeting.
https://cmdworkshop.sakura.ne.jp/index_eng.html
Organized by CSRN and Spin-RNJ
January 4, 2022 14th Meeting on “Ferroic-ordering and their manipulation” was held as an online virtual meeting.
http://annex.jsap.or.jp/ferroic/en/
Co-organized by CSRN and Spin-RNJ
December 20-21, 2021 The 26th Symposium on the Physics and Applications of Spin-related Phenomena in Semiconductors was held as an online virtual meeting.
https://www.ims.tsukuba.ac.jp/~kuroda_lab/PASPS26/
Co-organized by CSRN and Spin-RNJ
October 31-November 5, 2021 Joint International Conferences of The 24th International Conference on Electronic Properties of Two-dimensional Systems (EP2DS-24) and The 20th International Conference on Modulated Semiconductor Structures (MSS-20) was held as an online virtual meeting.
https://ep2ds24mss20.org/
Organized by CSRN and Spin-RNJ
September 6-10, 2021 39th Computational Materials Design (CMD®) Workshop – Autumn 2021 Live! Online was held as an online virtual meeting.
https://cmdworkshop.sakura.ne.jp/index_eng.html
Organized by CSRN and Spin-RNJ
July 10-11, 2021 In the Open Campus 2021 for high school students, which was held on July 10-11 at the University of Tokyo, Prof. Masaki Kobayashi gave a lecture “Watching electrons by X-ray – Solving mysteries of electronic materials”. The lecture was delivered online from his laboratory at the Hongo campus of the University of Tokyo. In the lecture, he demonstrated an experiment to observe electrons in materials using X-ray photoemission spectroscopy.
March 12, 2021 A Joint symposium of the Area 4, 1 and 3 –Fusion of classical-information and quantum-information science & technology by spintronics– in the 2021 Annual (76th) Meeting of the Physical Society of Japan was held as an online virtual meeting.
https://www.jps.or.jp/activities/meetings/joint_symposium/2021annual_joint_contents.php#spn
Co-organized by CSRN and Spin-RNJ, the Physical Society of Japan
March 9, 2021 Annual Workshop for the Spintronics Research Network of Japan was held as an online virtual meeting.
https://nozaki463.wixsite.com/website
Organized by CSRN and Spin-RNJ
February 24, 2021 We had an online seminar concerning a new thin-film growth method, which has been developed by Mannhart group in the Max Planck Institute, given by Dr. Boschker.
Abstract
Organized by CSRN and Spin-RNJ
February 22-26, 2021 38th Computational Materials Design (CMD®) Workshop – Spring 2021 Live! Online was held as an online virtual meeting.
https://cmdworkshop.sakura.ne.jp/index_eng.html
Organized by CSRN and Spin-RNJ
January 7-8, 2021 Seminar on “Introduction to Spintronics” was held as an online virtual meeting.
https://annex.jsap.or.jp/spintro/stage1/schedules/seminar2020.pdf
Organized by Spintronics Society of JSAP, Co-organized by CSRN and Spin-RNJ
January 4, 2021 12th Meeting on “Ferroic-ordering and their manipulation” was held as an online virtual meeting.
http://annex.jsap.or.jp/ferroic/en/
Co-organized by CSRN and Spin-RNJ
November 28-29, 2020 Vietnamese Academic Network in Japan (VANJ) Conference 2020 – Science and Technology in the New Normal was held as an online virtual meeting.
https://vanj.jp/vi/hoi-thao-khoa-hoc-vanj-2020-khoa-hoc-va-cong-nghe-trong-binh-thuong-moi/
Co-organized by CSRN and Spin-RNJ
November 17-19, 2020 The 25th Symposium on the Physics and Applications of Spin-related Phenomena in Semiconductors was held as an online virtual meeting.
http://csrn-osaka.sakura.ne.jp/spintronics/pasps-25/
Co-organized by CSRN and Spin-RNJ
August 31-September 4, 2020 37th Computational Materials Design (CMD®) Workshop – Autumn 2020 Live! Online was held as an online virtual meeting.
https://cmdworkshop.sakura.ne.jp/index_eng.html
Organized by CSRN and Spin-RNJ
June 3-4, 2020 Online Meeting of Spintronics Research Network of Japan (Spin-RNJ) for Young Researchers was held.
http://www.csrn.t.u-tokyo.ac.jp/online-meeting-2020/
Organized by CSRN and Spin-RNJ
February 17-21, 2020 36th Computational Materials Design (CMD®) Workshop – Spring 2020 – was held in Toyonaka campus of Osaka University.
https://cmdworkshop.sakura.ne.jp/index_eng.html
Organized by CSRN and Spin-RNJ
January 11, 2020 10th Meeting on “Ferroic-ordering and their manipulation” was held in Hongo Campus at the University of Tokyo.
http://annex.jsap.or.jp/ferroic/en/
Co-organized by CSRN and Spin-RNJ
December 17-18, 2019 The 24th Symposium on the Physics and Applications of Spin-related Phenomena in Semiconductors was held at Research Institute of Electrical Communication, Tohoku University.
http://www.pasps-24.riec.tohoku.ac.jp/
Co-organized by CSRN and Spin-RNJ
December 9, 2019 Symposium for the Spintronics Research Network of Japan was held in Toyonaka campus of Osaka University.
http://csrn-osaka.sakura.ne.jp/spintronics/2019/csrn_event2019/3254/
Organized by CSRN and Spin-RNJ
November 27, 2019 Seminar on “Introduction to Spintronics” was held in Koganei Campus at Tokyo University of Agriculture and Technology.
https://annex.jsap.or.jp/spintro/stage1/schedules/seminar2019.pdf
Organized by Spintronics Society of JSAP, Co-organized by CSRN and Spin-RNJ
November 22-23, 2019 3rd CSRN-Tokyo Workshop 2019 on “New Functional Spintronics Materials and Colossal Responses” was held in Hongo Campus at the University of Tokyo.
http://www.csrn.t.u-tokyo.ac.jp/workshop3/
Organized by CSRN and Spin-RNJ
September 29- October 2, 2019 26th International Workshop on Oxide Electronics was held at Institute for Chemical Research, Kyoto University (Uji campus).
https://www.scl.kyoto-u.ac.jp/~shimakgr/iWOE26/index.html
Co-organized by CSRN and Spin-RNJ
September 11, 2019 A Joint symposium of the Area 3 and 5 –Development of synchrotron radiation measurement technology with soft x-ray for next-generation Spintronics– in the 2019 Autumn Meeting of the Physical Society of Japan was held on Gifu University (Yanagido Campus).
Organized by CSRN and Spin-RNJ
September 2-6, 2019 35th Computational Materials Design (CMD®) Workshop – Autumn 2019 – was held in Toyonaka campus of Osaka University.
https://cmdworkshop.sakura.ne.jp/index_eng.html
Organized by CSRN and Spin-RNJ
August 22-23, 2019 The 11th Japan Synchrotron Radiation meeting for Young Scientists was held at Sakura Hall on Tohoku University (Katahira campus).
https://www.wpi-aimr.tohoku.ac.jp/quantumbeam/download/JSSRR_11th_Wakate_program.pdf
Co-organized by CSRN and Spin-RNJ
May 4, 2019 Vietnam-Japan Science and Technology Symposium 2019 (VJST2019) was held at VNU Vietnam Japan University, My Dinh Campus, Hanoi.
https://vanj.jp/vi/2019/05/
Sponsored by CSRN and Spin-RNJ
February 20, 2019 Symposium for the Spintronics Research Network of Japan was held at Institute for Materials Research, Tohoku University.
Organized by CSRN and Spin-RNJ
February 18-22, 2019 34th Computational Materials Design (CMD®) Workshop – Spring 2019 – was held in Toyonaka campus of Osaka University.
https://cmdworkshop.sakura.ne.jp/index_eng.html
Organized by CSRN and Spin-RNJ
January 21-22, 2019 International School on Spintronics and Korea-Japan Spintronics Workshop – Topological Phenomena in Magnetism -, Noyori Conference Hall, Higashiyama Campus, Nagoya University.
http://www.j-group.phys.nagoya-u.ac.jp/K_J_Workshop2019.html
Co-organized by CSRN and Spin-RNJ
December 13-15, 2018 CSRN-Osaka Annual Workshop 2018 was held in Toyonaka campus of Osaka University.
http://csrn-osaka.sakura.ne.jp/annual_workshop_2018/
Organized by Spin-RNJ
December 6-7, 2018 23rd Meeting on Physics and Applications of Spin Related Phenomena in Semiconductors was held at Tokyo Institute of Technology.
https://www.titech.ac.jp/english/company/event/2018/042305.html
Co-organized by CSRN and Spin-RNJ
October 27, 2018 2nd CSRN-Tokyo Workshop 2018 on “Spin, Neuromorphic Computring” was held in Hongo Campus at the University of Tokyo.
http://www.csrn.t.u-tokyo.ac.jp/workshop2/
Organized by CSRN and Spin-RNJ
September 15, 2018 The 11th Vietnam – Japan Scientific Exchange Meeting (VJSE2018) was held at Kawauchi Campus, Tohoku University, Sendai.
https://vanj.jp/vi/2018/09/
Sponsored by CSRN and Spin-RNJ
September 3-7, 2018 33th Computational Materials Design (CMD®) Workshop – Autumn 2018 – was held in Toyonaka campus of Osaka University.
https://cmdworkshop.sakura.ne.jp/index_eng.html
Organized by CSRN and Spin-RNJ
September 3-4, 2018 The 10th Japan Synchrotron Radiation meeting for Young Scientists was held in Hongo Campus at the University of Tokyo.
Co-organized by CSRN and Spin-RNJ
August 13-15, 2018 Explorative Workshop: Spintronic Perspectives on Neuromorphic Computing was held at Forschungszentrum Jülich, Peter Grünberg Institute, Germany.
https://www.fz-juelich.de/en/pgi/pgi-1/expertise/spnc
Co-organized by Forschungszentrum Jülich, Peter Grünberg Institute and CSRN and Spin-RNJ
July 5-6, 2018 Core-to-Core Japan Workshop 2018 “International Workshop on Nanoscale Electron-Photon Interactions via Energy Dissipation and Fluctuation” was held at Koshiba Hall, The University of Tokyo.
http://www.webpark1649.sakura.ne.jp/core_event.html
Co-organized by JSPS Core-to-Core program on “Nanoscale electron-photon interactions via dissipation and fluctuation.”
March 1, 2018 Symposium for the Spintronics Research Network of Japan was held at Takeda Hall on the Hongo/Asano Campus of the University of Tokyo.
http://www.csrn.t.u-tokyo.ac.jp/spin-rnj-symposium2017/
Organized by CSRN and Spin-RNJ
February 26- March 2, 2018 32th Computational Materials Design (CMD®) Workshop – Spring 2018 – was held in Toyonaka campus of Osaka University.
https://cmdworkshop.sakura.ne.jp/index_eng.html
Organized by CSRN and Spin-RNJ
December 21, 2017 25th Seminar of Core-to-Core program for cultivating of young scientists.
http://www.webpark1649.sakura.ne.jp/core_event.html
Co-organized by JSPS Core-to-Core program on “Nanoscale electron-photon interactions via dissipation and fluctuation.”
December 18-20, 2017 Japan-Korea Spintronics Workshop, Convention Hall (International Cooperation Building), KIST, Seoul, Korea
http://japankoreaworkshop.freecluster.eu/?i=2
Co-organized by CSRN and Spin-RNJ
December 6, 2017 24th Seminar of Core-to-Core program for cultivating of young scientists.
http://www.webpark1649.sakura.ne.jp/core_event.html
Co-organized by JSPS Core-to-Core program on “Nanoscale electron-photon interactions via dissipation and fluctuation.”
December 4-5, 2017 22nd Meeting on Physics and Applications of Spin Related Phenomena in Semiconductors was held at Osaka University.
http://www.sanken.osaka-u.ac.jp/labs/qse/PASPS22/
Co-organized by CSRN and Spin-RNJ
November 27, 2017 Seminar on “Introduction to Spintronics” was held in Tokyo Campus at University of Tsukuba.
https://annex.jsap.or.jp/spintro/stage1/schedules/seminar2017.pdf
Co-organized by JSAP, CSRN and Spin-RNJ
October 27-28, 2017 1st CSRN-Tokyo Workshop 2017 on “New Spintronics Functional Materials and Control of their Properties” was held in Hongo Campus at the University of Tokyo.
http://www.csrn.t.u-tokyo.ac.jp/workshop1/
Organized by CSRN and Spin-RNJ
Co-organized by the Spintronics Committee of JSAP
October 26, 2017 23rd Seminar of Core-to-Core program for cultivating of young scientists.
http://www.webpark1649.sakura.ne.jp/core_event.html
Co-organized by JSPS Core-to-Core program on “Nanoscale electron-photon interactions via dissipation and fluctuation.”
September 27-29, 2017 Junjiro Kanamori Memorial International Symposium –New Horizon of Magnetism– was held at Koshiba Hall, The University of Tokyo.
http://csrn-osaka.sakura.ne.jp/kanamori-memorial/
Co-organized by CSRN and Spin-RNJ
September 11-15, 2017 31th Computational Materials Design (CMD®) Workshop – Autumn 2017 – was held in Toyonaka campus of Osaka University.
https://cmdworkshop.sakura.ne.jp/index_eng.html
Organized by CSRN and Spin-RNJ
September 9, 2017 The 10th Vietnam – Japan Scientific Exchange Meeting (VJSE2017) was held at Toyosu campus, Shibaura Institute of Technology, Tokyo.
https://vanj.jp/vi/2017/09/
Sponsored by CSRN and Spin-RNJ
August 24, 2017 22nd Seminar of Core-to-Core program for cultivating of young scientists.
http://www.webpark1649.sakura.ne.jp/core_event.html
Co-organized by JSPS Core-to-Core program on “Nanoscale electron-photon interactions via dissipation and fluctuation.”
July 8, 2017 Japan-France workshop on Nanoscale Electron-Photon Interactions via Energy Dissipation and Fluctuation in Lyon, France.
Co-organized by JSPS Core-to-Core program on “Nanoscale electron-photon interactions via dissipation and fluctuation.”
June 27, 2017 21st. Seminar of Core-to-Core program for cultivating of young scientists.
http://www.webpark1649.sakura.ne.jp/core_event.html
Co-organized by JSPS Core-to-Core program on “Nanoscale electron-photon interactions via dissipation and fluctuation.”
June 4-8, 2017 9th Int. School and Conference on Spintronics and Quantum Information Technology (Spintech IX) was held in Fukuoka International Congress Center.
http://www.spintech9.iis.u-tokyo.ac.jp/
Co-organized by CSRN and Spin-RNJ
May 18, 2017 20th. Seminar of Core-to-Core program for cultivating of young scientists.
http://www.webpark1649.sakura.ne.jp/core_event.html
Co-organized by JSPS Core-to-Core program on “Nanoscale electron-photon interactions via dissipation and fluctuation.”
March 21-22, 2017 Spintronics and Core-to-Core Program Workshop“Computational Materials Design on Green Energy”was held at Senri-Hankyu Hotel in Osaka.
http://csrn-osaka.sakura.ne.jp/core2core2017/
Co-organized by JSPS Core-to-Core Program
February 27- March 3, 2017 30th Computational Materials Design (CMD®) Workshop – Spring 2017 – was held in Toyonaka campus of Osaka University.
https://cmdworkshop.sakura.ne.jp/index_eng.html
Organized by CSRN and Spin-RNJ
February 24, 2017 Cooperative Research Project Program Meeting of Research Institute of Electrical Communication (RIEC), Tohoku University
Co-organized by CSRN and Spin-RNJ
December 19-20, 2016 Quantum Community Symposium was held at Hiyoshi Campus of Keio University.
https://www.st.keio.ac.jp/news/stu/20170119_01.html
December 16-17, 2016 Seminar “Introduction to Spintronics”, Kyushu University.
http://ssp.phys.kyushu-u.ac.jp/qnsp/Workshop/2016_JSAP_Spintronics-School/index.html
Co-organized by CSRN and Spin-RNJ
December 15-16, 2016 Korea-Japan Spin-Orbit Workshop, Hakozaki Campus, Kyushu University
http://ssp.phys.kyushu-u.ac.jp/qnsp/Workshop/2016_JSAP_Spintronics-School/workshop_index.html
Co-organized by CSRN and Spin-RN
December 12-13, 2016 21st Worshop on Physics and Applications of Spin-Related Phenomena in Semiconductors (PASPS-21)
http://www.ist.hokudai.ac.jp/labo/nanodev/pasps/index.html
Co-organized by CSRN and Spin-RNJ
September 18-30, 2016 EU-JAPAN Workshop on Computational Materials Design and Realization for Spintronics, Moltronics, Quantronics, Superconductivity and Topotronics, Peter Grünberg Institute, Jülich Research Centre, Jülich, Germany,
https://www.fz-juelich.de/en/pgi/pgi-1/news/events/2016/2016-09-18-eu-japan-workshop
https://www.fz-juelich.de/en/pgi/pgi-15/downloads/conferencesandworkshops/eu-japan-workshop-reports
Co-organized by CSRN and Spin-RNJ
September 5-9, 2016 29th Computational Materials Design (CMD®) Workshop – Autumn 2016 – was held in Toyonaka campus of Osaka University
https://cmdworkshop.sakura.ne.jp/index_eng.html
Organized by CSRN and Spin-RNJ
Aug 8-11, 2016 9th International Conference on Physics and Applications of Spin-Related Phenomena in Solids (PASPS-9) was held at Kobe International Congress Center.
http://www.pasps9.org/
June 10, 2016 Kick-off Symposium for the Center for Spintronics Research Network (CSRN) of Osaka University was held at the Graduate School of Engineering Science, Osaka University.
http://csrn-osaka.sakura.ne.jp/spintronics/2016/csrn_event2016/2099/
May 24, 2016 Kick-off Symposium for the Center for Spintronics Research Network (CSRN) of Tohoku University was held at the Research Institute of Electrical Communication (RIEC), Tohoku University.
http://www.tohoku.ac.jp/japanese/2016/05/press20160519-01.html
May 19, 2016 Kick-off Symposium for the Spintronics Research Network of Japan (Spin-RNJ) and the Center for Spintronics Research Network (CSRN) of the University of Tokyo was held at Takeda Hall on the Hongo/Asano Campus of the University of Tokyo.
http://www.cryst.t.u-tokyo.ac.jp/SpintronicsCenter/
April 1, 2016 Spintronics Research Network of Japan (Spin-RNJ) and Center for Spintronics Research Network (CSRN) launched.

Research

January 18, 2024 Shingo Takada (Kaneta) (D3)(Department of Electrical Engineering and Information Systems) has been awarded the JSPS Ikushi Prize.
Title: Highly efficient spin-charge conversion at a single-crystal oxide interface for next-generation spintronics devices
<About the JSPS Ikushi Prize>
In 2009, the Japan Society for the Promotion of Science (JSPS) received an endowment from His Majesty the Emperor Emeritus Akihito on the 20th year of his reign. Amidst a severe economic environment in Japanese society, His Majesty’s desire was to encourage and support young scientists who are working diligently to advance their studies and research.
In deference to his wishes, JSPS established the JSPS Ikushi Prize and placed it into operation in FY 2010. It functions to formally recognize outstanding doctoral students who can be expected to contribute to Japan’s future scientific advancement.
(https://www.jsps.go.jp/j-ikushi-prize/kettei.html)
January 15, 2024 Large Spin Splitting in a Nonmagnetic Semiconductor Demonstrated to be Controllable by Voltage
– Pioneering the Feasibility of Next-Generation Semiconductor Spintronics Devices –
A research group (Harunori Shiratani, Kosuke Takiguchi, Associate Professor Le Duc Anh, and Professor Masaaki Tanaka) at the Department of Electrical Engineering and Information Systems, Graduate School of Engineering, The University of Tokyo, has fabricated a bilayer heterostructure consisting of a nonmagnetic semiconductor InAs and a ferromagnetic semiconductor (Ga,Fe)Sb. The giant spin splitting due to the magnetic coupling at the interface was observed in the nonmagnetic semiconductor. The maximum energy of the spin splitting reached 18 meV, which is more than four times higher than that of the previous study by the same group. The structure fabricated by the research group is a two-layer heterojunction consisting of a thin film of InAs (12 nm thick), a nonmagnetic semiconductor, and a thin film of GaFeSb (15 nm thick), a ferromagnetic semiconductor. The heterojunction is fabricated into a transistor, and by applying a gate voltage, the coupling strength between the electrons in InAs and the ferromagnetism of GaFeSb can be increased or decreased, thereby inducing and modulating spin splitting in the electronic state of the nonmagnetic InAs. The research results were published online in the British scientific journal Communications Physics on January 15, 2024. In addition, the results of this research were press released, and reported in several media outlets.
Paper: Harunori Shiratani, Kosuke Takiguchi, Le Duc Anh, and Masaaki Tanaka, “Observation of large spin-polarized Fermi surface of a magnetically proximitized semiconductor quantum well”, Communication Physics 7, pp.6/1-7 (2024).
DOI; 10.1038/s42005-023-01485-6
<Press Releases>
Observation of large spin-polarized Fermi surface of a magnetically proximitized semiconductor quantum well
https://www.t.u-tokyo.ac.jp/en/press/pr2024-01-16-001
November 15, 2023 Associate Professor Hikari Shinya, Professor Shinobu Ohya, and Emeritus Researcher Hiroshi Yoshida of the Department of Electrical Engineering & Information Systems (EEIS) and Center for Spintronics Research Network (CSRN), in collaboration with the National Institute of Advanced Industrial Science and Technology (AIST) and Osaka University, has successfully developed a new first-principles calculation method that can predict “transport properties at finite temperatures”, which has been difficult to achieve using conventional first-principles approaches. Furthermore, they has revealed the cause of the anomalous temperature dependence of the electrical conduction properties of the ferromagnetic semiconductor (Ga,Mn)As. The newly developed method can be applied to material systems other than ferromagnetic semiconductors, and is expected to contribute to shortening the development time and reducing the cost of materials in various fields. This result has been published in APL Materials. In addition, a press release was issued by the University of Tokyo and reported in several media outlets.
Paper: Hikari Shinya, Tetsuya Fukushima, Kazunori Sato, Shinobu Ohya, and Hiroshi Katayama-Yoshida, “Theoretical study on the origin of anomalous temperature-dependent electric resistivity of ferromagnetic semiconductor”, APL Materials 11, 111114 (2023).
https://doi.org/10.1063/5.0165352
DOI: DOI: 10.1063/5.0165352
<Press Releases>
Theoretical study on the origin of anomalous temperature-dependent electric resistivity of ferromagnetic semiconductor
https://www.t.u-tokyo.ac.jp/en/press/pr2023-11-15-001
September 28, 2023 The Vietnam News Agency’s TV news program VNews (September 28, 2023) broadcasted an introduction of Ain Laboratory and interviews (Associate Professor Leduc Ain, Master’s student Harunori Shiratani, and Professor Masaaki Tanaka).
https://vnews.gov.vn/video/cau-noi-thuc-day-quan-he-viet-nam-nhat-ban-95710.htm
A bridge to promote relations between Vietnam and Japan.
Young intellectuals, emerging entrepreneurs, and many enthusiastic international students are playing a leading role in the development of the Vietnamese community in Japan and actively contributing to economic development of Japanese society – a bridge of friendship and cooperation between the two countries.
September 20, 2023 Tatsuro Endo (D1, Ohya Lab, Dept of Electrical Engineering and Information Systems, Graduate School of Enginering, The University of Tokyo) has received the English Presentation Award for the following presentation at the 84th Japan Society of Applied Physics (JSAP) Autumn Meeting.
Tatsuro Endo, Shun Tsuruoka, Yuriko Tadano, Shingo Kaneta-Takada, Le Duc Anh, Masaaki Tanaka, and Shinobu Ohya, “Gate modulation of current in the metal-insulator transition region of La0.67Sr0.33MnO3“, The 70th JSAP Spring Meeting 2023, 16p-D704-11, Sophia University, March 17, 2023.
August 1, 2023 Ultrafast sub-picosecond magnetization control through electron wave function manipulation
Associate Professor Le Duc Anh, Associate Professor Masaki Kobayashi, Project Research Associate Takahito Takeda, and Professor Masaaki Tanaka of the Department of Electrical Engineering & Information Systems (EEIS) and Center for Spintronics Research Network (CSRN), in collaboration with the Institute for Molecular Science and RIKEN, have achieved ultrafast magnetization control at sub-picosecond rates through electron wave function manipulation. They have demonstrated a new functionality for low-power spin devices operating in the terahertz frequency band.
This result has been published in Wiley’s journal Advanced Materials.
Press releases were issued by the University of Tokyo, RIKEN, and SPring-8 and reported in several media outlets.
Paper: Le Duc Anh, Masaki Kobayashi, Takahito Takeda, Kohsei Araki, Ryo Okano, Toshihide Sumi, Masafumi Horio, Kohei Yamamoto, Yuya Kubota, Shigeki Owada, Makina Yabashi, Iwao Matsuda, Masaaki Tanaka, “Ultrafast subpicosecond magnetisation of a 2D ferromagnet”, Advanced Materials 2023, pp.2301347/1-8 (2023).
https://onlinelibrary.wiley.com/doi/epdf/10.1002/adma.202301347
DOI: 10.1002/adma.202301347
<Press Releases>
Ultrafast subpicosecond magnetisation of a 2D ferromagnet
https://www.t.u-tokyo.ac.jp/en/press/pr2023-08-01-001
May 31, 2023 Tatsuro Endo (D1), Associate Professor Masaki Kobayashi, Associate Professor Le Duc Anh, Associate Professor Munetoshi Seki, Professor Hitoshi Tabata, Professor Masaaki Tanaka, and Professor Shinobu Ohya et al., in the Department of Electrical Engineering and Systems Engineering, have made lateral 2-terminal spin-valve devices, the basis of spin transistors, using single crystal oxides and succeeded in obtaining a large magnetoresistance ratio, more than 10 times greater than previous lateral spin-valve devices, and in gate modulation of a current.
This result has been published in Wiley’s journal Advanced Materials.
A press release was issued by the University of Tokyo and reported by several media outlets.
Paper: T. Endo, S. Tsuruoka, Y. Tadano, S. Kaneta-Takada, Y. Seki, M. Kobayashi, L. D. Anh, M. Seki, H. Tabata, M. Tanaka, and S. Ohya, “Giant spin-valve effect in planar spin devices using an artificial implemented nanolength Mott-insulator region”, Adv. Mater. 2023, 2300110 (2023).
https://onlinelibrary.wiley.com/doi/10.1002/adma.202300110
<Press Releases>
Giant Spin-Valve Effect in Planar Spin Devices Using an Artificially Implemented Nanolength Mott-Insulator Region
https://www.t.u-tokyo.ac.jp/en/press/pr2023-05-31-001
November 17, 2022 Associate Professor Le Duc Anh, Department of Electrical Engineering & Information Systems (EEIS) and Center for Spintronics Research Network (CSRN), has been selected as a “Distinguished Researcher” of the University of Tokyo for the 2022 academic year.
https://www.u-tokyo.ac.jp/focus/ja/articles/t_z1402_00012.html
This is based on the University of Tokyo’s “Support Program for Young Researchers’ Independence (The University of Tokyo Distinguished Researchers)”, which aims to support outstanding young researchers to start up their research activities.
November 10, 2022 Kosuke Takiguchi (graduate student at the time of the research, Tanaka Lab.), Harunori Shiratani (graduate student, Tanaka Lab.), Associate Professor Le Duc Anh, Professor Masaaki Tanaka, and their colleagues have reported giant odd-parity magnetoresistance (OME) in nonmagnetic/ferromagnetic semiconductor heterostructures.
The discovery of the giant OMR has been reported in press release by the Tokyo University and Japan Science and Technology Agency.
The research results were reported in several media reports.
<Press Releases>
Discovery of Giant Odd-Parity Magnetoresistance in Nonmagnetic/Ferromagnetic Semiconductor Heterostructures – Unique Electronic Transport Phenomenon Caused by “Symmetry Breaking” in Materials, Possibility of Next-Generation Quantum Devices
http://www.t.u-tokyo.ac.jp/en/press/pr2022-11-10-001
<Media Coverage>
Tii Technical Information
https://tiisys.com/blog/2022/11/10/post-113368/
Mynavi News
https://news.mynavi.jp/techplus/article/20221111-2510429/
Mapion News
https://www.mapion.co.jp/news/column/cobs2510492-1-all/
Robot-tech.com
https://robot-tech.jp/news/20221111.html
November 9, 2022 Discovery of Giant Odd-Parity Magnetoresistance in Nonmagnetic/Ferromagnetic Semiconductor Heterostructures -Unique Electronic Transport Phenomenon due to “Symmetry Breaking” in Materials, a Possibility for Next-Generation Quantum Devices
The research has been carried out by graduate student Kosuke Takiguchi, Associate Professor Le Duc Anh, graduate student Harunori Shiratani, and Professor Masaaki Tanaka of Department of Electrical Engineering and Information Systems, graduate student Ryota Fukuzawa and Professor Takuji Takahashi of Institute of Industrial Science, and Lecturer Takahiro Chiba of Fukushima National College of Technology. They fabricated bilayer heterostructure consisting of a nonmagnetic semiconductor (InAs) and a ferromagnetic semiconductor (GaFeSb). The research group has discovered a new electronic transport phenomenon that exhibits giant odd-parity magnetoresistance. The results were published online in Nature Communications on Nov.9, 2022.In ordinary materials, the change in electrical resistance (magnetoresistance effect) when a magnetic field is applied is exactly the same when the direction of the magnetic field is reversed. However, in the InAs/(Ga,Fe)Sb semiconductor heterostructures fabricated by the research group, giant odd-parity magnetoresistance (OMR) was discovered, in which the electrical resistance changes by 27% when the external magnetic field direction is reversed. This new OMR occurs in a one-dimensional conduction channel formed on the side edges of a nonmagnetic semiconductor layer, and it is caused by (1) “spatial inversion symmetry breaking” due to the surface potential of the side edge and (2) “time reversal symmetry breaking” due to magnetic proximity effect from the adjacent ferromagnetic semiconductor (Ga,Fe)Sb. This phenomenon is significant because the giant electromagnetic response due to symmetry breaking appeared in semiconductor heterostructures, which are compatible with electronics, and is expected to be used in next-generation spintronics such as highly sensitive magnetic-field sensors.
The research results were published online in Nature Communications on November 9, 2022.
Kosuke Takiguchi, Le Duc Anh, Takahiro Chiba, Harunori Shiratani, Ryota Fukuzawa, Takuji Takahashi, and Masaaki Tanaka, “Giant gate-controlled odd-parity magnetoresistance in one-dimensional channels with a magnetic proximity effect”, Nature Communications 13, pp.6538/1-7 (2022).
https://doi.org/10.1038/s41467-022-34177-w
DOI: 10.1038/s41467-022-34177-w
October 25, 2022 At the 2022 Autumn Matriculation Ceremony of the University of Tokyo held at the Yasuda Auditorium on October 1st, Mr. Yu Baisen, first-year doctoral student in the Department of Electrical Engineering and Information Systems (Tanaka-Nakane Laboratory), gave the pledge as representative of the incoming students.
Published in the University of Tokyo Public Relations No.1563 (October 25, 2022). Photo on p.8, photo and the pledge on p.15.
https://www.u-tokyo.ac.jp/ja/about/public-relations/kouhou.html
https://www.u-tokyo.ac.jp/content/400200348.pdf
September 27, 2022 Dr. Shobhit Goel (Postdoctoral Researcher, Masaaki Tanaka Laboratory) received the SSDM2021 Young Researcher Award at the International Conference on Solid State Devices and Materials (SSDM), September 25-27, 2022, for the following paper:
Shobhit Goel, Nguyen Huynh Duy Khang, Le Duc Anh, Pham Nam Hai, and Masaaki Tanaka, “Room-temperature spin injection and spin-to-charge conversion in a ferromagnetic semiconductor / topological insulator heterostructure”, Presented at the International Conference on Solid State Devices and Materials (SSDM 2021), All-Virtual, September 6-9, 2021.
September 22, 2022 Associate Professor Atsushi Kobayashi, Master course student Shunya Kihira, Assistant Professor Kohei Ueno, Professor Hiroshi Fujioka of Institute of industrial Science, The University of Tokyo, PhD candidate Takahito Takeda, Associate Professor Masaki Kobayashi of Center for Spintronics Research Network, The University of Tokyo, and Dr. Takayuki Harada of National Institute for Materials Science have succeeded in fabricating high quality heterostructures between superconductor and semiconductor using nitrides. The achievement has been published in a Germany science journal “Advanced Materials Interface” on 22th September (in JST).
Paper: Atsushi Kobayashi*, Shunya Kihira, Takahito Takeda, Masaki Kobayashi, Takayuki Harada, Kohei Ueno, and Hiroshi Fujioka, “Crystal-phase controlled epitaxial growth of NbNx superconductors on wide-bandgap AlN semiconductors”, Advanced Materials Interfaces, published on September 21th, 2022.
https://doi.org/10.1002/admi.202201244
<Press Releases>
Crystal-Phase Controlled Epitaxial Growth of NbNx Superconductors on Wide-Bandgap AlN Semiconductors
https://www.t.u-tokyo.ac.jp/en/press/pr2022-09-26-001
September 21, 2022 Mr. Harunori Shiratani (M1 student, Masaaki Tanaka Laboratory, Dept. of Electrical Engineering & Information Systems) received the Best English Presentation Award from the Spintronics Research Committee of the Japan Society of Applied Physics, on September 21, 2022, for the following presentation:
Harunori Shiratani, Kosuke Takiguchi, Le Duc Anh, and Masaaki Tanaka, “Spin-split Fermi surface of InAs/(Ga,Fe)Sb nonmagnetic/ferromagnetic bilayer semiconductor heterostructures”, 2022 Spring Meeting of the Japan Society of Applied Physics, 23p-E205-1, Sagamihara Campus, Aoyama-Gakuin University, Online, March 22-25, 2022.
June 16, 2022 Professor Le Duc Anh (Dept of Electrical Engineering and Information Systems, CSRN) received the Young Investigator MBE Award, at the International Conference on Molecular Beam Epitaxy, ICMBE 2022.
The citation is ”MBE growth, physics and devices of new Fe-based III-V ferromagnetic semiconductors for semiconductor spintronics and topological quantum electronics”.
https://iop.eventsair.com/icmbe2022/awards
June 3, 2022 Professor Masaaki Tanaka received the Quantum Devices Award, at the International Symposium of Compound Semiconductors (ISCS 2022), Compound Semiconductor Week (CSW 2022), held in Ann Arbor, MI, USA, June 1-3, 2022.
The citation is ”For pioneering accomplishments of epitaxial synthesis of advanced semiconductor based spintronics materials and structures for exploratory devices applications”.
https://csw2022.engin.umich.edu/sponsor/awards/
https://csw2022.engin.umich.edu/wp-content/uploads/sites/62/2022/06/CSW-2022-Awards-Program.pdf
March 30, 2022 Mr. Tomoki Hotta (1st year, Ph.D. student, Department of Electrical Engineering and Information Systems, Tanaka Laboratory) received the Outstanding Student MBE Award for the following oral presentation at the International Conference on Molecular Beam Epitaxy 2021:
T. Hotta, K. Takase, K. Takiguchi, K. Sriharsha, L. D. Anh, and M. Tanaka
“Quaternary-alloy ferromagnetic semiconductor (In,Ga,Fe)Sb”
21st International Conference on Molecular Beam Epitaxy, Virtual Conference, Mexico, September 6-9, 2021.
Tomoki Hotta, Outstanding Student MBE Award, announced on March 30, 2022 at the 21st International Conference on Molecular Beam Epitaxy, Hosted by Cinvestav (Center for Research and Advanced Studies of the National Polytechnic Institute), Mexico.
December 22, 2021 Le Duc Anh, Masaaki Tanaka, and co-workers report the epitaxial growth of elemental topological Dirac semimetal α-Sn with the highest quality thus far. The very high quantum mobilities in these samples allow a quantitative characterization of the nontrivial interfacial and bulk band structure of α-Sn via quantum transport in combination with first-principles calculations. The results establish α-Sn as an excellent model system to study novel topological phases and device applications.
https://onlinelibrary.wiley.com/doi/10.1002/adma.202170404
DOI: 10.1002/adma.202170404
October 14, 2021 The group of Dr. Le Duc Anh, Kengo Takase (2nd year master), Kosuke Takiguchi (3rd year doctor), and Professor Masaaki Tanaka, in collaborations with Dr. Takahiro Chiba and Associate Professor Yohei Kota of Fukushima College, National Institute of Technology, succeeded in growing the world’s highest quality alpha-tin (α-Sn) thin films on III-V group compound semiconductor indium antimonide (InSb) (001) substrates. For the first time, they have clarified various topological properties of  α-Sn thin films, including a rare topological Dirac semimetal phase, via quantum transport measurements. The results of this research are expected to pave the way towards a new platform for topological physics and quantum device technologies.
Published paper: Le Duc Anh, Kengo Takase, Takahiro Chiba, Yohei Kota, Kosuke Takiguchi, and Masaaki Tanaka; “Elemental Topological Dirac Semimetal α-Sn with High Quantum Mobility”, Advanced Materials 33, pp.2104645/1-9 (2021).
https://onlinelibrary.wiley.com/doi/10.1002/adma.202104645
DOI: 10.1002/adma.202104645
<Press Releases>
Elemental Topological Dirac Semimetal α-Sn with High Quantum Mobility
https://www.t.u-tokyo.ac.jp/soee/press/setnws_202110181023006384857500.html
August 30, 2021 Hiroshi Katayama-Yoshida (CSRN, The University of Tokyo/ Professor Emeritus of Osaka University), M. Hussein N. Assadi (The University of New South Wales, Research Fellow), José Julio Gutiérrez Moreno (Barcelona Supercomputing Center, Senior Researcher), and Dorian A. H. Hanaor (Technische Universität Berlin, Lecturer) performed international collaboration in computational nano-materials design by the international collaboration based on the network laboratories. We have designed that rare-earth element of Eu with large spin-orbit interaction is doped in magnetite, and obtained exceptionally large (2.3 times larger tan pristine magnetite) saturation magnetizatin. The mechanism of the especially large saturation magnetization and general design rules are proposed. We also proposed the control method of the saturation magnetization by chemical doping and applayd electric field. These results are published in Physical Chemistry Chemical Physics (Royal Society of Chemistry) on September 2.
Paper:M. Hussein N. Assadi, José Julio Gutiérrez Moreno, Dorian A. H. Hanaor, and Hiroshi Katayama-Yoshida, “Exceptionally high saturation magnetisation in Eu-doped magnetite stabilised by spin-orbit interaction”, Physical Chemistry Chemical Physics.
https://pubs.rsc.org/en/content/articlelanding/2021/cp/d1cp02164h/unauth
DOI: 10.1039/D1CP02164H
August 24, 2021 Based on the collaboration with Network-Laboratories at CSRN (SPIN-RNJ) of The University of Tokyo, Osaka University and Tohoku University, Hiroshi Katayama-Yoshida (CSRN, Senior Research Fellow, The University of Tokyo, and Professor Emeritus Osaka University), Tetsuya Fukushima (Project Associate Professor, ISSP, The University of Tokyo) proposed new valence control method (“EX-doping method”) to fabricate low-resistivity p-type ultra-wide band-gap semiconductors, which was difficult to fabricate due to the unipolarity, by the ab initio electronic structure calculations of doping with magnetic elements. “EX-doping method” is universal and general, and does not depend on the host materials, therefore, it is expected that “EX-doping method” can apply not only for ultra-wide band-gap nitride but also for oxides and carbides, which are always difficult to synthesize the low-resistivity p-type materials due to the unipolarity.
This result was published on August 24, 2021 in Applied Physics Express (JSAP).
Paper:A. Masago, H. Shinya, T. Fukushima, K. Sato, H. Katayama-Yoshida, “A novel method for generating p-type wide- and ultrawide-bandgap III-nitride by doping with magnetic elements”, Applied Physics Express, 14, 091007.
https://iopscience.iop.org/article/10.35848/1882-0786/ac197f
DOI: 10.35848/1882-0786/ac197f
<Press Releases>
Design of new valence control method for next generation semiconductors
~EX-doping method: universal and general valence control method which does not depend on the host materials~
https://www.t.u-tokyo.ac.jp/soee/press/setnws_202108262005204086545114.html
July 7, 2021 Le Duc Anh, Taiki Hayakawa, Yuji Nakagawa, Hikari Shinya, Tetsuya Fukushima, Masaki Kobayashi, Hiroshi Katayama-Yoshida, Yoshihiro Iwasa and Masaaki Tanaka have published an article in Nature Communications;
“Ferromagnetism and giant magnetoresistance in zinc-blende FeAs monolayers embedded in semiconductor structures”, Nature Communications 12, pp.4201/1-10 (2021).
https://www.nature.com/articles/s41467-021-24190-w
DOI: 10.1038/s41467-021-24190-w
<Press Releases>
Ferromagnetism and giant magnetoresistance in zinc-blende FeAs monolayers embedded in semiconductor structures
https://www.t.u-tokyo.ac.jp/foee/press/setnws_202107091138489426579798.html
December 4, 2020 Profs. Shinobu Ohya, Masaki Kobayashi, Pham Nam Hai, Masaaki Tanaka and Atsushi Fujimori in collaboration with Dr. Yukiharu Takeda’s group of Materials Sciences Research Center, Japan Atomic Energy Agency, have successfully observed the magnetic ordering process in the ferromagnetic semiconductor Ga1-xMnxAs via soft x-ray magnetic circular dichroism.
This result was published in
Yukiharu Takeda, Shinobu Ohya, Pham Nam Hai, Masaki Kobayashi, Yuji Saitoh, Hiroshi Yamagami, Masaaki Tanaka, and Atsushi Fujimori, “Direct observation of the magnetic ordering process in the ferromagnetic semiconductor Ga1-xMnxAs via soft x-ray magnetic circular dichroism”, J. Appl. Phys. 128, pp.213902/1-11 (2020).
https://doi.org/10.1063/5.0031605
This paper was selected as a “Featured Article” and featured on the “Cover” of Journal of Applied Physics.
November 30, 2020 Dr. Jiang Miao, Prof. Shinobu Ohya, and Prof. Masaaki Tanaka have demonstrated highly efficient magnetization switching by spin-orbit torque in a spin-orbit ferromagnet with an extremely low current density Jc = 4.6 x 104 A/cm2, which is the lowest value ever reported.
This result was published in
Miao Jiang, Hirokatsu Asahara, Shoichi Sato, Shinobu Ohya and Masaaki Tanaka, “Suppression of the field-like torque for efficient magnetization switching in a spin–orbit ferromagnet”,Nature Electronics, published on November 30, 2020.
https://www.nature.com/articles/s41928-020-00500-w
<UTokyo FOCUS>
Lower current leads to highly efficient memory: Memory based on the physics of spintronics could offer high speeds at low power
https://www.u-tokyo.ac.jp/focus/en/articles/z0508_00112.html
<Nature Research>
https://go.nature.com/359hFy3
https://devicematerialscommunity.nature.com/posts/highly-efficient-spin-orbit-torque-switching-with-low-power-consumption-in-a-spin-orbit-ferromagnet-single-layer
October 12, 2020 Mr. Kosuke Takiguchi and Prof. Masaaki Tanaka (CSRN and Dept of Electrical Engineering & Information Systems, The University of Tokyo), in collaboration with Dr. Wakabayashi Research Group (NTT Basic Research Laboratories) and Dr. Das Research Group (Tokyo Institute of Technology), have observed quantum transport phenomena peculiar to an exotic state, and have successfuly realized the magnetic Weyl semimetal state in ultrahigh-quality SrRuO3 thin films. This research was reported in Nature Communications on October 9th, 2020.
Paper: Kosuke Takiguchi, Yuki K. Wakabayashi, Hiroshi Irie, Yoshiharu Krockenberger, Takuma Otsuka, Hiroshi Sawada, Sergey A. Nikolaev, Hena Das, Masaaki Tanaka, Yoshitaka Taniyasu and Hideki Yamamoto “Quantum transport evidence of Weyl fermions in an epitaxial ferromagnetic oxide”, Nature Communications 11, 4969/1-12 (2020).
https://www.nature.com/articles/s41467-020-18646-8
DOI: 10.1038/s41467-020-18646-8
<Press Releases>
Quantum transport evidence of Weyl fermions in an epitaxial ferromagnetic oxide : Professor Masaaki Tanaka, Department of Electrical Engineering and Information Systems, and other researchers
http://www.t.u-tokyo.ac.jp/soee/press/setnws_202010121001147083331780.html
October 8, 2020 Dr. Toru Hirahara, Dr. Masaki Kobayashi et al. shed light on the relationship between the magnetic properties of topological insulators and their electronic band structure. Their experimental results shed new insights into recent debates regarding the evolution of the band structure with temperature in these materials, which exhibit unusual quantum phenomena and are envisioned to be crucial in next-generation electronics, spintronics, and quantum computers. This result has been published in Nature Communications.
Paper: T. Hirahara, M. M. Otrokov, T. T. Sasaki, K. Sumida, Y. Tomohiro, S. Kusaka, Y. Okuyama, S. Ichinokura, M. Kobayashi, Y. Takeda, K. Amemiya, T. Shirasawa, S. Ideta, K. Miyamoto, K. Tanaka, S. Kuroda, T. Okuda, K. Hono, S. V. Eremeev & E. V. Chulkov, “Fabrication of a novel magnetic topological heterostructure and temperature evolution of its massive Dirac cone”, Nature Communications 11, 4821 (2020).
https://www.nature.com/articles/s41467-020-18645-9
DOI: 10.1038/s41467-020-18645-9
<Press Releases>
Fabrication of a novel magnetic topological heterostructure and temperature evolution of its massive Dirac cone : Associate Professor Masaki Kobayashi, Center for spintronics Research Network, and other researchers.
https://www.t.u-tokyo.ac.jp/soee/press/setnws_202010081330482948978968.html
February 28, 2020 Dr. Le Duc Anh, Mr. Shingo Kaneta (Tanaka-Ohya lab.) et al. have successfully realized a two-dimensional hole gas with a mobility up to 24000 cm2/Vs, which is the highest value for holes among those ever reported for oxides, using a SrTiO3 interface. This result has been published in Advanced Materials.
Paper: L. D. Anh, S. Kaneta, M. Tokunaga, M. Seki, H. Tabata, M. Tanaka, and S. Ohya, “High-Mobility 2D Hole Gas at a SrTiO3 Interface”, Adv. Mater. 2020, 1906003.
https://onlinelibrary.wiley.com/doi/full/10.1002/adma.201906003
DOI: 10.1002/adma.201906003
<Press Releases>
High-Mobility Two-Dimensional Hole Gas at an SrTiO3 Interface:Assistant Professor Le Duc Anh(Institute of Engineering Innovation), Shingo Kaneta(M1)(Department of Electrical Engineering and Information Systems), Associate Professor Munetoshi Seki(Center for Spintronics Research Network), Prof. Hitoshi Tabata(Department of Bioengineering/Department of Electrical Engineering and Information Systems), Prof. Masaaki Tanaka(Department of Electrical Engineering and Information Systems), Associate Professor Shinobu Ohya(Institute of Engineering Innovation/Department of Electrical Engineering and Information Systems), and other researchers
http://www.t.u-tokyo.ac.jp/soee/press/setnws_202002281528256851081170.html
August 26, 2019 Mr. Kosuke Takiguchi, Dr. Le Duc Anh, and Prof. Masaaki Tanaka (Dept of EEIS, Graduate School of Engineering), in collaboration with Dr. Tomohiro Koyama, Prof. Daichi Chiba (Dept of Applied Physics, Graduate School of Engineering), and have demonstrated that nonmagnetic (NM) /ferromagnetic (FM) bilayers consisting of a NM InAs quantum well (QW) conductive channel and an insulating FM (Ga,Fe)Sb layer exhibit giant proximity magnetoresistance (PMR) (~80% at 14 T). This PMR is two orders of magnitude larger than the MR observed in NM/FM bilayers reported to date, and its magnitude can be controlled by a gate voltage. These findings provide a pathway to achieve local access to Majorana fermions in InAs-based Josephson junctions by gate-controlled MPE, as well as represent a new concept of magnetic-gating spin transistors in which the NM channel current is strongly modulated by both electrical and magnetic means. This result was published in Nature Physics.
Paper: Kosuke Takiguchi, Le Duc Anh, Takahiro Chiba, Tomohiro Koyama, Daichi Chiba, Masaaki Tanaka, Giant gate-controlled proximity magnetoresistance in semiconductor-based ferromagnetic–non-magnetic bilayers, Nature Physics, published on August 26, 2019.
href=”https://www.nature.com/articles/s41567-019-0621-6
<Press Releases>
Giant gate-controlled proximity magnetoresistance in semiconductor-based ferromagnetic–non-magnetic bilayers
https://www.t.u-tokyo.ac.jp/soee/press/setnws_201908271548567216589426.html
June 13, 2019 Ms Miao Jiang, Prof. Shinobu Ohya, and Prof. Masaaki Tanaka have demonstrated that a new low-power magnetic switching component can aid spintronic devices. They have grown a perpendicularly magnetized GaMnAs thin film, whose magnetization can be switched by a very small current density 3.4×105A/cm2. This result has been published in Nature Communications.
Paper: Miao Jiang, Hirokatsu Asahara, Shoichi Sato, Toshiki Kanaki, Hiroki Yamasaki, Shinobu Ohya, and Masaaki Tanaka, Efficient full spin-orbit torque switching in a single layer of a perpendicularly magnetized single-crystalline ferromagnet, Nature Communications vol. 10, 2590 (2019).
https://www.nature.com/articles/s41467-019-10553-x
<Press Releases>
Efficient full spin-orbit torque switching in a single layer of a perpendicularly magnetized single-crystalline ferromagnet
http://www.t.u-tokyo.ac.jp/soee/press/setnws_201906141317581413537162.html
March 15, 2019 Dr. Taketomo Nakamura, Prof. Shingo Katsumoto (ISSP), Dr. Le Duc Anh, Prof. Shinobu Ohya, and Prof. Masaaki Tanaka (Dept of EEIS, Graduate School of Engineering) have successfully observed superconducting current with spin-triplet electron pairing in junctions consisting of an n-type ferromagnetic semiconductor (In,Fe)As and Nb contacts. This result will open up the possibility of new superconducting spintronics devices using the functions of magnetism, superconductivity, and semiconductors.
Taketomo Nakamura, Le Duc Anh, Yoshiaki Hashimoto, Shinobu Ohya, Masaaki Tanaka, and Shingo Katsumoto, “Evidence for Spin-Triplet Electron Pairing in the Proximity-Induced Superconducting State of an Fe-Doped InAs Semiconductor”, Physical Review Letters 122, 107001 (2019).
https://doi.org/10.1103/PhysRevLett.122.107001
February 12, 2019 Dr. Tomoaki Ishii, Prof. Masaaki Tanaka, and Prof. Shinobu Ohya (Dept of EEIS, Graduate School of Engineering), in collaboration with Prof. Hiroshi Okamoto (Graduate School of Frontier Science), have observed giant modulation up to 20% of the magnetization with picosecond-ultra-short terahertz-pulse irradiation using ferromagnetic MnAs nanoparticles embedded in a semiconductor GaAs. This modulation ratio is around more than twenty times larger than those obtained in previous studies using ferromagnetic-metal thin films. This result will facilitate the development of ultra-fast non-volatile memory devices.
Paper: T. Ishii, H. Yamakawa, T. Kanaki, T. Miyamoto, N. Kida, H. Okamoto, M. Tanaka, and S. Ohya, Large terahertz magnetization response observed in ferromagnetic nanoparticles, Applied Physics Letters 114, 062402 (2019).
https://aip.scitation.org/doi/10.1063/1.5088227
<UTokyo FOCUS>
Nanoparticles help realize ‘spintronic’ devices: Researchers demonstrate nanoparticle systems crucial for new high-speed devices
https://www.u-tokyo.ac.jp/focus/en/press/z0508_00031.html
July 31, 2018 A research team led by Prof. Pham Nam Hai at the Department of Electrical and Electronic Engineering, Tokyo Institute of Technology (Tokyo Tech), has developed thin films of BiSb for a topological insulator that simultaneously achieves a colossal spin Hall effect and high electrical conductivity. Their study, published in Nature Materials, could accelerate the development of high-density, ultra-low power, and ultra-fast non-volatile memories for Internet of Things (IoT) and other applications. Their study has been published in Nature Materials.
<Press release>
A colossal breakthrough for topological spintronics
BiSb expands the potential of topological insulators for ultra-low-power electronic devices
https://www.titech.ac.jp/english/news/2018/042001.html
https://www.titech.ac.jp/english/news/pdf/tokyotechpr_en_pham_20180731_PB98ipEz.pdf
<Paper published in Nature Materials>
https://www.nature.com/articles/s41563-018-0137-y
June 4, 2018 Dr. Le Duc Anh, Prof. Pham Nam Hai, and Prof. Masaaki Tanaka have successfully fabricated a spin Esaki diode composed of an n-type ferromagnetic semiconductor (FMS) indium iron arsenide (In,Fe)As – a hybrid material made by doping iron (Fe) into indium arsenide (InAs), a III-V semiconductor well-known for high-speed device applications – and p-type indium arsenide.
Their “UTokyo Research” Article was published online on June 4, 2018.
https://www.u-tokyo.ac.jp/en/utokyo-research/research-news/scientists-create-new-functionality-in-a-spin-esaki-diode.html
March 23, 2018 Associate Professor Masaki Kobayashi has been awarded Young Scientist Award of the Physical Society of Japan for his study on “Electronic structure analysis on ferromagnetic semiconductors using synchrotron radiation spectroscopy”.
http://www.jps.or.jp/english/file/12th_wakate2018.pdf
March 5, 2018 Dr. Le Duc Anh, Prof. Pham Nam Hai, and Prof. Masaaki Tanaka (Dept EE&IS, CSRN) published their work on spin-Esaki diode in Applied Physics Letters, and this paper was selected as a Featured Article.
Le Duc Anh, Pham Nam Hai, and Masaaki Tanaka
“Electrical tuning of the band alignment and magnetoconductance in an n-type ferromagnetic semiconductor (In,Fe)As-based spin-Esaki diode”
Appl. Phys. Lett. 112, pp.102402/1-4 (2018).
https://aip.scitation.org/doi/10.1063/1.5010020Scilight on this study was published online on 05 March 2018.
“A change in sign brings a sign of change for spin-current devices”
https://aip.scitation.org/doi/full/10.1063/1.5027513
DOI: 10.1063/1.5027513
Our sclight articles was posted on the AIP’s Facebook, Twitter, and LinkedIn accounts
Facebook post: https://www.facebook.com/AIPPublishing/posts/1891608884243807
Twitter post: https://twitter.com/AIP_Publishing/status/978666787154907136
LinkedIn post: https://www.linkedin.com/feed/update/urn:li:activity:6384432430543040512
February 21, 2018 Dr. Le Duc Anh (Research Associate, Tanaka-Ohya Lab) received the Best Presentation Award for his oral presentation entitled
“Fe based narrow-gap ferromagnetic semiconductors: New materials for high-performance spintronic devices”
(Le Duc Anh, Nguyen Thanh Tu, Pham Nam Hai, and Masaaki Tanaka),
at the 9th Research Exchange Meeting of Cryogenic Research Center, The University of Tokyo, on February 21st, 2018, at Itoh International Center, The University of Tokyo. He was awarded in the 50th Founding
Anniversary Ceremony and Lectures of Cryogenic Research Center, The University of Tokyo.
http://www.crc.u-tokyo.ac.jp/kenkyukoryu/index.html
December 14, 2017 The group of Prof. Pham Nam Hai (Tokyo Institute of Technology) and Prof. Masaaki Tanaka (Univ. of Tokyo) published their work on nanoscale Si-based spin-valve devices in Journal of Applied Physics, and this article has been chosen as a Featured Article.
Duong Dinh Hiep, Masaaki Tanaka, and Pham Nam Hai
“Inverse spin-valve effect in nanoscale Si-based spin-valve devices”
J. Appl. Phys. 122, pp.223904/1-7 (2017).
http://scitation.aip.org/content/aip/journal/jap/122/22/10.1063/1.4994881
DOI:10.1063/1.4994881A Scilight article (sharp quick summaries illustrating the latest physics research) was published online on 12 December 2017.
“Ballistic transport in spin-valve Si channel demonstrates feasibility of nanoscale spin-MOSFETs”
Ballistic electron motion in nanoscale Si channels of a lateral spin-valve device, in addition to improved conductivity matching, advances spintronics technology towards spin-MOSFETS.
http://scitation.aip.org/content/aip/journal/sci/2017/25/10.1063/1.5018722
DOI:10.1063/1.5018722
August 18, 2017 Le Duc Anh, Noboru Okamoto, Munetoshi Seki, Hiroshi Tabata, Masaaki Tanaka, and Shinobu Ohya have published an article in Scientific Reports;
“Hidden peculiar magnetic anisotropy at the interface in a ferromagnetic perovskite-oxide heterostructure”
Scientific Reports 7, pp.8715/1-7 (2017).
https://www.nature.com/articles/s41598-017-09125-0
DOI:10.1038/s41598-017-09125-0
July 17, 2017 Hiroshi Terada, Shinobu Ohya, Le Duc Anh, Yoshihiro Iwasa, and Masaaki Tanaka have published an article in Scientific Reports;
“Magnetic anisotropy control by applying an electric field to the side surface of ferromagnetic films”
Scientific Reports 7, pp.5618/1-7 (2017).
https://www.nature.com/articles/s41598-017-05799-8
DOI:10.1038/s41598-017-05799-8
May 26, 2017 <UTokyo Research> Research News
Pioneering new methods for designing magnetism - Controlling magnetization by band engineering and quantum confinement –
http://www.u-tokyo.ac.jp/en/utokyo-research/research-news/pioneering-new-methods-for-designing-magnetism.html
May 23, 2017 This work was circulated as a press release and featured in UTokyo Research.
<Press Release>
https://www.t.u-tokyo.ac.jp/soee/press/setnws_20170523142218386417892165.html
https://www.t.u-tokyo.ac.jp/shared/press/data/setnws_20170523140647385782197839_369247.pdf
May 22, 2017 Iriya Muneta, Toshiki Kanaki, Shinobu Ohya, and Masaaki Tanaka (University of Tokyo) have published an article in Nature Communications;
“Artificial control of the bias-voltage dependence of tunnelling-anisotropic magnetoresistance using quantization in a single-crystal ferromagnet”
Nature Communications 8, 15387/1-8 (2017).
https://www.nature.com/articles/ncomms15387
March 17, 2017 The following paper was selected as “Highlights of 2016” in Applied Physics Express.
Yuki Wakabayashi, Kohei Okamoto, Yoshisuke Ban, Shoichi Sato, Masaaki Tanaka, and Shinobu Ohya, “Tunneling magnetoresistance in trilayer structures composed of group-IV-based ferromagnetic semiconductor Ge1-xFex, MgO, and Fe”, Appl. Phys. Express 9, pp.123001/1-4 (2016).
http://doi.org/10.7567/APEX.9.123001
Selected as Highlights of 2016.
http://iopscience.iop.org/journal/1882-0786/page/APEX_Highlights_2016
January 27, 2017 Press Release by Applied Physics Letter: The paper on high temperature ferromagnetism in heavily Fe-doped ferromagnetic semiconductor (Ga,Fe)Sb [Appl. Phys. Lett. 108, 192401 (2016)] was selected as one of the Most Read Articles in 2016.
http://aip-info.org/1XPS-4OFYS-4BJ9EWC562/cr.aspx
Only two papers were selected in the field of magnetism. This paper is the only one from Japan.
December 20, 2016 This work was circulated as a press release and featured in UTokyo Research.
<Press release>
http://www.t.u-tokyo.ac.jp/soee/press/setnws_20161220132858969252174136.html
http://www.t.u-tokyo.ac.jp/shared/press/data/setnws_20161220131227492413935565_903088.pdf
<UTokyo Research>
Study picks up large spontaneous spin splitting in the energy band structure ~ Making strides towards new semiconductor devices using spin ~
http://www.u-tokyo.ac.jp/en/utokyo-research/research-news/study-picks-up-large-spontaneous-spin-splitting-in-the-energy-band-structure.html
December 19, 2016 Le Duc Anh, Pham Nam Hai, and Masaaki Tanaka published an article on Nature Communications.
“Observation of spontaneous spin-splitting in the band structure of an n-type zinc-blende ferromagnetic semiconductor” Nature Communications 7, 13810 (2016).
http://www.nature.com/articles/ncomms13810
https://dx.doi.org/10.1038/ncomms13810
October 31, 2016 Interview with Prof. Masaaki Tanaka by Yazaki Science and Technology Foundation.
http://www.yazaki-found.jp/search/recipient503.html
October 28, 2016 The following paper has been selected as 2016 Spotlight of Applied Physics Express
Yuki K. Wakabayashi, Kohei Okamoto, Yoshisuke Ban, Shoichi Sato, Masaaki Tanaka, and Shinobu Ohya
Tunneling magnetoresistance in trilayer structures composed of group-IV-based ferromagnetic semiconductor Ge1−x Fex , MgO, and Fe
Appl. Phys. Express 9, 123001 (2016)
http://iopscience.iop.org/article/10.7567/APEX.9.123001/meta
August 11, 2016 Young Researcher Best Poster Awards were conferred on the following reserchers and presentations from our CSRN/Spin-RNJ at the 9th
International Conference on Physics and Applications of Spin-Related Phenomena in Solids (PASPS9), Kobe International Conference Center, Kobe, August 8-11, 2016.
http://www.pasps9.org/index.
Le Duc Anh, Pham Nam Hai, and Masaaki Tanaka
“Spontaneous spin-split band structure of n-type ferromagnetic semiconductor (In,Fe)As observed by tunneling spectroscopy”Yuki K. Wakabayashi, Ryota Akiyama, Yukiharu Takeda, Masafumi Horio, Goro Shibata, Shoya Sakamoto, Yoshisuke Ban, Yuji Saitoh, Hiroshi Yamagami, Atsushi Fujimori, Masaaki Tanaka, and Shinobu Ohya
“Origin of the large positive magnetoresistance in Ge1-xMnx granular films”S. Sakamoto, Y. K. Wakabayashi, Y. Takeda, S.-i. Fujimori, H. Suzuki, Y. Ban, H. Yamagami, M. Tanaka, S. Ohya and A. Fujimori
“Electronic structure of the ferromagnetic semiconductor Ge1-xFex revealed by soft x-ray angle-resolved photoemission spectroscopy”T. Nakamura, Y. Iwasaki, L. D. Anh, Y. Hashimoto, S. Ohya, M. Tanaka, and S. Katsumoto
“Josephson effect in Nb/(In,Fe)As/Nb junctions”
June 28, 2016 Muneta, Ohya, Terada, and Tanaka published an article “Sudden restoration of the band ordering associated with the ferromagnetic phase transition in a semiconductor” in Nature Communications .
http://www.nature.com/ncomms/2016/160628/ncomms12013/full/ncomms12013.html
June 29, 2016 This work was circulated as a press release and featured in UTokyo Research.
<Press release>
http://www.t.u-tokyo.ac.jp/soee/press/setnws_20160629170907378121330888.html
http://www.t.u-tokyo.ac.jp/shared/press/data/setnws_20160629165157140380611381_971740.pdf
<UTokyo Research>
http://www.u-tokyo.ac.jp/en/utokyo-research/research-news/new-discovery-in-semiconductor-physics.html
May 9, 2016 Tu, Hai, Anh, and Tanaka published a letter “High-temperature ferromagnetism in heavily Fe-doped ferromagnetic semiconductor (Ga,Fe)Sb” in Applied Physics Letters (Issue of May 9, 2016), and the paper was selected as a FEATURED ARTICLE.
http://scitation.aip.org/content/aip/journal/apl/108/19/10.1063/1.4948692
This work was also featured in AIP Publishing in the News.
https://www.aip.org/publishing/journal-highlights/best-both-worlds
PAGE TOP