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Observation of self-induced spin torque in a single ferromagnet and demonstration of novel rf generator

Research Project

Project/Area Number 18K19012
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 29:Applied condensed matter physics and related fields
Research InstitutionTohoku University

Principal Investigator

Seki Takeshi  東北大学, 金属材料研究所, 准教授 (40579611)

Co-Investigator(Kenkyū-buntansha) 好田 誠  東北大学, 工学研究科, 准教授 (00420000)
Project Period (FY) 2018-06-29 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥6,240,000 (Direct Cost: ¥4,800,000、Indirect Cost: ¥1,440,000)
Fiscal Year 2019: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Fiscal Year 2018: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Keywordsスピントロニクス / スピン軌道相互作用 / スピントルク / 強磁性体 / スピン流 / 高周波発振
Outline of Final Research Achievements

The purposes of this research project are the elucidation of underlying mechanism of spin-charge conversion in ferromagnets and the development of ferromagnet with high conversion efficiency in order to observe the “self-induced spin torque” in a single ferromagnetic layer. We evaluated the spin orbit torque in the single ferromagnetic layer by using the harmonic Hall voltage measurement. We also observed the spin anomalous Hall effect exploiting the spin torque ferromagnetic resonance method, and successfully demonstrated the magnetization switching induced by spin anomalous Hall effect. In addition, we elucidated the spin-charge conversion mechanism in the ferromagnetic Heusler alloys. These findings and achievements will be beneficial to understand and control the self-induced spin torque.

Academic Significance and Societal Importance of the Research Achievements

近年、軌道の自由度を取り入れスピン軌道相互作用を積極的に活用するスピンオービトロニクスが、学術的観点さらにはデバイス応用の観点から注目を集めている。スピンオービトロニクスでは、電流とスピン角運動量の流れであるスピン流をいかに効率よく変換し制御するかがキーとなるが、強磁性体内部での変換現象は理解が進んでいなかった。本研究で得られた成果は、そのメカニズムの理解に繋がるものであり、単一の磁性体のみで構成される究極に単純な構造の発振素子など全く新しいスピントロニクスデバイスの実現可能性を拓くものである。

Report

(3 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • Research Products

    (16 results)

All 2020 2019 Other

All Journal Article (6 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 6 results,  Open Access: 4 results) Presentation (8 results) (of which Int'l Joint Research: 5 results,  Invited: 3 results) Remarks (2 results)

  • [Journal Article] Anomalous spin-orbit field via the Rashba-Edelstein effect at the W/Pt interface2020

    • Author(s)
      S. Karube, N. Tezuka, M. Kohda, and J. Nitta
    • Journal Title

      Physical Review Applied,

      Volume: 13 Issue: 2 Pages: 024009-024009

    • DOI

      10.1103/physrevapplied.13.024009

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Evaluation of spin-orbit torque in a L10-FePt single layer and a L10-FePt/Pt2019

    • Author(s)
      T. Sato, T. Seki, M. Kohda, J-C. Ryu, H. Gamou, S. Karube, K. Takanashi, and J. Nitta
    • Journal Title

      Japanese Journal of Applied Physics

      Volume: 58 Issue: 6 Pages: 060915-060915

    • DOI

      10.7567/1347-4065/ab1e5a

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Large spin anomalous Hall effect in L10-FePt: Symmetry and magnetization switching2019

    • Author(s)
      T. Seki, S. Iihama, T. Taniguchi, and K. Takanashi
    • Journal Title

      Physical Review B

      Volume: 100 Issue: 14

    • DOI

      10.1103/physrevb.100.144427

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Spin-charge conversion in NiMnSb Heusler alloy films2019

    • Author(s)
      Z. Wen, Z. Qiu, S. T_lle, C. Gorini, T. Seki, D. Hou, T. Kubota, U. Eckern, E. Saitoh, and K. Takanashi
    • Journal Title

      Science Advances

      Volume: 5 Issue: 12

    • DOI

      10.1126/sciadv.aaw9337

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Structural-order dependence of anomalous Hall effect in Co2MnGa topological semimetal thin films2019

    • Author(s)
      Q. Wang, Z. Wen, T. Kubota, T. Seki, and K. Takanashi
    • Journal Title

      Applied Physics Letters

      Volume: 115 Issue: 25

    • DOI

      10.1063/1.5127553

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Enhancement of spin current generation in epitaxial a-Ta/CoFeB bilayer2019

    • Author(s)
      H. Gamou, Y. Du, M. Kohda, and J. Nitta,
    • Journal Title

      Physical Review B

      Volume: 99 Issue: 18 Pages: 184408-184408

    • DOI

      10.1103/physrevb.99.184408

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] Spin-Charge Conversion in Ferromagnetic Materials2020

    • Author(s)
      T. Seki and K. Takanashi
    • Organizer
      New Perspective in Spin Conversion Science (NPSCS2020)
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Spin-Charge Conversion in Ferromagnets2020

    • Author(s)
      T. Seki and K. Takanashi
    • Organizer
      The 3rd Symposium for The Core Research Clusters for Materials Science and Spintronics
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] L10-FePtにおけるスピン異常ホール効果2019

    • Author(s)
      関剛斎、飯浜賢志、谷口知大、高梨弘毅
    • Organizer
      第43回磁気学会学術講演会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Spin-Charge Conversion in Ferromagnetic Materials2019

    • Author(s)
      T. Seki and K. Takanashi
    • Organizer
      17th RIEC International Workshop on Spintronics and 10th JSPS Core-to-Core Workshop on “New-Concept Spintronic Devices”
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Large Spin Anomalous Hall Effect in L10-FePt2019

    • Author(s)
      T. Seki, S. Iihama, T. Taniguchi, and K. Takanashi
    • Organizer
      Materials Research Meeting 2019 (MRM2019)
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Field-free current induced perpendicular magnetization switching property in epitaxial Ta/CoFeB/MgO structure2019

    • Author(s)
      H. Gamou, S. Nishimura, M. Kohda and J. Nitta
    • Organizer
      第80回応用物理学会秋季学術講演会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Anomalous spin-orbit field via Rashba-Edelstein effect at W/Pt interface2019

    • Author(s)
      S. Karube、N. Tezuka、M. Kohda、J. Nitta
    • Organizer
      第80回応用物理学会秋季学術講演会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Spin Anomalous Hall Effect in L10-FePt2019

    • Author(s)
      T. Seki, S. Iihama, T. Taniguchi, K. Takanashi
    • Organizer
      The 2nd Symposium for World Leading Research Centers ‐ Materials Science and Spintronics ‐
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Remarks] http://magmatelab.imr.tohoku.ac.jp

    • Related Report
      2019 Annual Research Report
  • [Remarks] 研究室ホームページ

    • URL

      http://magmatelab.imr.tohoku.ac.jp

    • Related Report
      2018 Research-status Report

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Published: 2018-07-25   Modified: 2021-02-19  

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