Events

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) will be 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/
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).
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://arpes.phys.tohoku.ac.jp/contents/spin-network/spin-network.html
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.
http://www.fz-juelich.de/SharedDocs/Termine/PGI/PGI-1/EN/2018/2018-08-13-Spintronic-Workshop.html?nn=926646
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.bioxide.t.u-tokyo.ac.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.bioxide.t.u-tokyo.ac.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.bioxide.t.u-tokyo.ac.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.bioxide.t.u-tokyo.ac.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.bioxide.t.u-tokyo.ac.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.bioxide.t.u-tokyo.ac.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.bioxide.t.u-tokyo.ac.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.
http://www.tgu.keio.ac.jp/docs/Creativity_Initiative_Symposium.pdf
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,
http://www.fz-juelich.de/pgi/EN/Leistungen/ConferencesAndWorkshops/EU-JAPAN-Workshop/_node.html
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.shirai.riec.tohoku.ac.jp/csrn/index.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

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
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