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Spin-orbit torque induced magnetization switching using Wyle semimetals and its device application

Research Project

Project/Area Number 20H02174
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 21050:Electric and electronic materials-related
Research InstitutionHokkaido University

Principal Investigator

Uemura Tetsuya  北海道大学, 情報科学研究院, 教授 (20344476)

Co-Investigator(Kenkyū-buntansha) 近藤 憲治  北海道大学, 電子科学研究所, 准教授 (50360946)
Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥17,550,000 (Direct Cost: ¥13,500,000、Indirect Cost: ¥4,050,000)
Fiscal Year 2022: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2021: ¥6,240,000 (Direct Cost: ¥4,800,000、Indirect Cost: ¥1,440,000)
Fiscal Year 2020: ¥7,020,000 (Direct Cost: ¥5,400,000、Indirect Cost: ¥1,620,000)
Keywords磁性ワイル半金属 / スピン軌道相互作用 / スピン軌道トルク / 強磁性トンネル接合 / ハーフメタル強磁性体 / ワイル半金属
Outline of Research at the Start

本研究の目的は,磁性ワイル半金属材料において発現する強いスピン軌道相互作用を利用した強磁性体磁化制御の学理を確立し,高速性・低消費電力性に優れたスピントロニクスデバイスを実現することである.そのため,ワイル半金属であることが理論的に指摘されているCo基ホイスラー合金をスピン源としたスピン軌道トルクの特性を明らかし,これを利用した磁気抵抗素子ならびに高周波自励発振デバイスを開拓する.本研究の進展により,物性物理学で近年注目されているトポロジカル物質に関する学理の解明が進むことが期待され,さらに,高速性,低消費電力性に優れた磁気メモリや発振素子,高感度磁気センサーへの応用が可能となる.

Outline of Final Research Achievements

The purpose of this study are to clarify the physics of spin-orbit torque induced by a spin current generated in Wyle semimetals with strong spin orbit interaction, and to develop a basic technology to realize spintronic devices with high-speed and low power consumption. To do this, we investigated the anomalous Hall effect in Co-based Heusler alloys, such as Co2MnAl and Co2MnGa, which are theoretically predicted to be Wyle semimetals, and demonstrated the SOT-induced magnetization switching of perpendicularly magnetized CoFeB thin film with no external magnetic field.

Academic Significance and Societal Importance of the Research Achievements

ワイル半金属はトポロジカル絶縁体とともに,物性物理学において近年大きな注目を集めているが,その研究対象はフェルミ面におけるワイル点の観測などの物性探索が主であり,デバイス応用の研究は極めて少ない.本研究の進展により,これまでに多くの研究がなされてきたスピントロニクスデバイスにおいて,ワイル半金属の有効性を示すことができ,トポロジカル材料を利用したスピントロニクスデバイスの創生という新たな流れを創出することに貢献できる.

Report

(4 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Annual Research Report
  • 2020 Annual Research Report
  • Research Products

    (39 results)

All 2023 2022 2021 2020 Other

All Journal Article (8 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 8 results,  Open Access: 8 results) Presentation (29 results) (of which Int'l Joint Research: 13 results) Remarks (2 results)

  • [Journal Article] Deterministic field-free switching of perpendicular magnetization by spin?orbit torques originating from in-plane magnetized Co<sub>2</sub>MnAl2023

    • Author(s)
      Morita Daimu、Hara Takuya、Yamanouchi Michihiko、Uemura Tetsuya
    • Journal Title

      AIP Advances

      Volume: 13 Issue: 1 Pages: 015037-015037

    • DOI

      10.1063/9.0000484

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Observation of topological Hall torque exerted on a domain wall in the ferromagnetic oxide SrRuO32022

    • Author(s)
      Yamanouchi Michihiko、Araki Yasufumi、Sakai Takaki、Uemura Tetsuya、Ohta Hiromichi、Ieda Jun’ichi
    • Journal Title

      Science Advances

      Volume: 8 Issue: 15

    • DOI

      10.1126/sciadv.abl6192

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] General formula of chiral anomaly for type-I and type-II Weyl semimetals2021

    • Author(s)
      Morishima K.、Kondo K.
    • Journal Title

      Applied Physics Letters

      Volume: 119 Issue: 13 Pages: 131907-131907

    • DOI

      10.1063/5.0059547

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Spin-orbit Torque in Structures with Magnetization-compensated MnGa/Co2MnSi bilayer2021

    • Author(s)
      Hara Takuya、Jono Kohey、Yamanouchi Michihiko、Uemura Tetsuya
    • Journal Title

      IEEE Transactions on Magnetics

      Volume: - Issue: 8 Pages: 1-4

    • DOI

      10.1109/tmag.2021.3139899

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Spin-orbit torque induced magnetization switching for an ultrathin MnGa/Co2MnSi bilayer2021

    • Author(s)
      Jono Kohey、Shimohashi Fumiaki、Yamanouchi Michihiko、Uemura Tetsuya
    • Journal Title

      AIP Advances

      Volume: 11 Issue: 2 Pages: 025205-025205

    • DOI

      10.1063/5.0032732

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] A comparison of magnetoconductivities between type-I and type-II Weyl semimetals2021

    • Author(s)
      Morishima K.、Kondo K.
    • Journal Title

      Journal of Applied Physics

      Volume: 129 Issue: 12 Pages: 125104-125104

    • DOI

      10.1063/5.0039554

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Off-stoichiometry effect on magnetic damping in thin films of Heusler alloy Co2MnSi2020

    • Author(s)
      Li Ting、Yan Wei、Zhang Xinhui、Hu Bing、Moges Kidist、Uemura Tetsuya、Yamamoto Masafumi、Tsujikawa Masahito、Shirai Masafumi、Miura Yoshio
    • Journal Title

      Physical Review B

      Volume: 101 Issue: 17 Pages: 174410-174410

    • DOI

      10.1103/physrevb.101.174410

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] A proposal of strong and weak phases in second-order topological insulators2020

    • Author(s)
      Komori Shiryu、Kondo Kenji
    • Journal Title

      Journal of Physics Communications

      Volume: 4 Issue: 12 Pages: 125005-125005

    • DOI

      10.1088/2399-6528/abd0d4

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] Spin-orbit torque induced magnetization switching in perpendicularly magnetized MnGa/Fe bilayer grown on GaAs2023

    • Author(s)
      Mineto Ogawa, Takuya Hara, Shun Hasebe, Michihiko Yamanouchi, and Tetsuya Uemura
    • Organizer
      IEEE International Magnetics Conference 2023 (INTERMAG 2023)
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Microfabrication and Characterization of Ferromagnetic Metal/Nonmagnetic Semiconductor Junctions for Spin Pumping-Induced Highly Efficient Spin Injection2023

    • Author(s)
      Theo Balland, Takeshi Seki, Takumi Yamazaki, Rie Umetsu, Mineto Ogawa, Tetsuya Uemura, and Koki Takanashi
    • Organizer
      IEEE International Magnetics Conference 2023 (INTERMAG 2023)
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Current-induced domain wall motion in a perpendicularly magnetized Co2MnGa/Pd2023

    • Author(s)
      Takaya Koyama, Yuki Nishioka, Tetsuya Uemura, and Michihiko Yamanouchi
    • Organizer
      第70回応用物理学会春季学術講演会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Spin-orbit torque induced magnetization switching in perpendicularly magnetized MnGa/Fe bilayer grown on GaAs2023

    • Author(s)
      Mineto Ogawa, Takuya Hara, Michihiko Yamanouchi, and Tetsuya Uemura
    • Organizer
      第70回応用物理学会春季学術講演会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Spin injection based on spin pumping in microfabricated ferromagnetic metal/nonmagnetic semiconductor junctions2023

    • Author(s)
      Theo Balland, Takeshi Seki, Takumi Yamazaki, Rie Umetsu, Mineto Ogawa, Tetsuya Uemura, Koki Takanashi
    • Organizer
      第70回応用物理学会春季学術講演会
    • Related Report
      2022 Annual Research Report
  • [Presentation] ワイル強磁性体Co2MnAlを用いたスピン軌道トルク磁化反転2023

    • Author(s)
      森田大夢,原拓也,山ノ内路彦,植村哲也
    • Organizer
      第58回応用物理学会北海道支部/第19回日本光学会北海道支部合同学術講演会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 磁性ワイル半金属 Co2MnGaを用いた強磁性トンネル接合におけるトンネル磁気抵抗2023

    • Author(s)
      千葉拓人, 德山星哉, 西岡優輝, 植村哲也, 山ノ内路彦
    • Organizer
      第58回応用物理学会北海道支部/第19回日本光学会北海道支部合同学術講演会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Pd/Co2MnGa垂直磁化膜における電流誘起磁壁移動2023

    • Author(s)
      小山貴也,西岡優輝,植村哲也,山ノ内路彦
    • Organizer
      第58回応用物理学会北海道支部/第19回日本光学会北海道支部合同学術講演会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 有限膜厚の強磁性体薄膜におけるスキルミオン半径のマイクロマグネティックシミュレーション2023

    • Author(s)
      三隅亮汰,植村哲也,山ノ内路彦
    • Organizer
      第58回応用物理学会北海道支部/第19回日本光学会北海道支部合同学術講演会
    • Related Report
      2022 Annual Research Report
  • [Presentation] GaAs基板上に形成したCoFeB垂直磁化膜のスピン軌道トルク磁化反転2023

    • Author(s)
      小川峰登, 山ノ内路彦, 植村哲也
    • Organizer
      第58回応用物理学会北海道支部/第19回日本光学会北海道支部合同学術講演会
    • Related Report
      2022 Annual Research Report
  • [Presentation] MgAlO4基板上に形成したCo2MnAl薄膜の異常ホール効果2023

    • Author(s)
      菅原聖威,山ノ内路彦,植村哲也
    • Organizer
      第58回応用物理学会北海道支部/第19回日本光学会北海道支部合同学術講演会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Field-free switching of perpendicular magnetization by spin-orbit torques originating from in-plane magnetized Co2MnAl spin source2022

    • Author(s)
      Daimu Morita, Takuya Hara, Michihiko Yamanouchi, and Tetsuya Uemura
    • Organizer
      The 67th Annual Conference on Magnetism and Magnetic Materials (MMM 2022)
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Spin-orbit torque in structures with magnetization-compensated MnGa/Co2MnSi bilayer2022

    • Author(s)
      Takuya Hara, Kohey Jono, Michihiko Yamanouchi, Tetsuya Uemura
    • Organizer
      Joint MMM INTERMAG Conference 2022
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Nonmonotonic temperature dependence of current-induced effective magnetic field exerted on domain wall in SrRuO32022

    • Author(s)
      Michihiko Yamanouchi, Yasufumi Araki, Takaki Sakai, Tetsuya Uemura, Hiromichi Ohta and Jun’ichi Ieda
    • Organizer
      Joint MMM INTERMAG Conference 2022
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Spin-orbit Torque in Synthetic Antiferromagnets Consisting of MnGa/Co2MnSi Bilayer2021

    • Author(s)
      Takuya Hara, Kohey Jono, Michihiko Yamanouchi, and Tetsuya Uemura
    • Organizer
      The 5th International Symposium for The Core Research Cluster for Spintronics
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Positive Magnetoresistance in Weyl Semimetals Originating from Chiral Anomaly2021

    • Author(s)
      K. Morishima and K. Kondo
    • Organizer
      2021 International Conference on Solid State Devices and Materials (SSDM2021)
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Reduced Velocities of Antiferromagnetic Skyrmions Induced by Fluctuations of Topological Charges2021

    • Author(s)
      T. Naruse and K. Kondo
    • Organizer
      The 5th Symposium for the Core Research Clusters for Materials Science and Spintronics
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] The Origin of Positive Magnetoresistance in Type-II Weyl Semimetals2021

    • Author(s)
      K. Morishima and K. Kondo
    • Organizer
      The 5th Symposium for the Core Research Clusters for Materials Science and Spintronics
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Spin-orbit torque in structures with magnetization-compensated MnGa/Co2MnSi2021

    • Author(s)
      Takuya Hara, Kohey Jono, Michihiko Yamanouchi, Tetsuya Uemura
    • Organizer
      第82回応用物理学会秋季学術講演会
    • Related Report
      2021 Annual Research Report
  • [Presentation] The structural and magnetic properties of an ultra-thin MnGa/Fe bilayer deposited on GaAs substrate2021

    • Author(s)
      Shun Hasebe, Takuya Hara, Michihiko Yamanouchi, and Tetsuya Uemura
    • Organizer
      第82回応用物理学会秋季学術講演会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Anomalous Hall effect in Co2MnAl thin films grown on MgO and MgAl2O4 substrates2021

    • Author(s)
      Osamu Ishidoya, Michihiko Yamanouchi, and Tetsuya Uemura
    • Organizer
      第82回応用物理学会秋季学術講演会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Temperature dependence of current-induced effective magnetic field acting on domain wall in SrRuO32021

    • Author(s)
      Takaki Sakai, Michihiko Yamanouchi, Yasufumi Araki, Tetsuya Uemura, Hiromichi Ohta, and Jun’ichi Ieda
    • Organizer
      第82回応用物理学会秋季学術講演会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Type-IIワイル半金属におけるカイラル異常由来の正の磁気抵抗効果2021

    • Author(s)
      森島 一輝、近藤 憲治
    • Organizer
      第82回応用物理学会秋季学術講演会
    • Related Report
      2021 Annual Research Report
  • [Presentation] トポロジカルチャージの揺らぎが反強磁性体中のスカーミオンの速度に与える影響2021

    • Author(s)
      成瀬 貴彦、近藤 憲治
    • Organizer
      第82回応用物理学会秋季学術講演会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Spin-orbit torque in MnGa/Co2MnSi synthetic antiferromagnetic bilayers2021

    • Author(s)
      K. Jono, T. Hara, F. Shimohashi, M. Yamanouchi and T. Uemura
    • Organizer
      The 4th International Symposium for The Core Research Cluster for Spintronics
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] MnGa/Co2MnSi bilayer for spin-orbit torque magnetization switching2020

    • Author(s)
      M. Yamanouchi, K. Jono, F. Shimohashi, and T. Uemura
    • Organizer
      65th Annual Conference on Magnetism and Magnetic Materials
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Enhancement of magnetoresistance characteristics of Ge-rich Co2Fe(Ga,Ge)-based current-perpendicular-to-plane giant magnetoresistance devices2020

    • Author(s)
      K. Nakada, Y. Chikaso, T. Tanimoto, M. Inoue, K. Inubushi, and T. Uemura
    • Organizer
      65th Annual Conference on Magnetism and Magnetic Materials
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Spin-orbit-torque induced magnetization switching for an ultra-thin MnGa/Co2MnSi bilayer2020

    • Author(s)
      K. Jono, F. Shimohashi, M. Yamanouchi, and T. Uemura
    • Organizer
      2020 International Conference on Solid State Devices and Materials (SSDM2020)
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Spin-orbit-torque induced magnetization switching for an ultra-thin MnGa/Co2MnSi bilayer2020

    • Author(s)
      Kohey Jono, Fumiaki Shimohashi, Michihiko Yamanouchi, and Tetsuya Uemura
    • Organizer
      第81回応用物理学会秋季学術講演会
    • Related Report
      2020 Annual Research Report
  • [Remarks] カイラルアノマリー公式の拡張に成功

    • URL

      https://www.hokudai.ac.jp/news/2021/10/type-ii.html

    • Related Report
      2021 Annual Research Report
  • [Remarks] 磁化反転に応用可能な新原理トルクを世界で初めて実証~磁気メモリの大幅な省電力化が期待~

    • URL

      https://www.hokudai.ac.jp/news/2022/04/post-1024.html

    • Related Report
      2021 Annual Research Report

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Published: 2020-04-28   Modified: 2024-01-30  

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