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Microscopic analysis of spin current generation in static strain structures

Research Project

Project/Area Number 21K20356
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeMulti-year Fund
Review Section 0202:Condensed matter physics, plasma science, nuclear engineering, earth resources engineering, energy engineering, and related fields
Research InstitutionKeio University

Principal Investigator

Funato Takumi  慶應義塾大学, グローバルリサーチインスティテュート(矢上), 特任助教 (10908700)

Project Period (FY) 2021-08-30 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2022: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2021: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywordsスピン流 / 格子歪み / 表面弾性波 / ナノチューブ / スピン起電力 / スピン・回転結合 / スピントロニクス / スピンダイナミクス
Outline of Research at the Start

本研究では、物体の静的な歪みとスピンの結合を利用したスピン流生成機構について微視的な解析を行う。スピントロニクスにおける中心概念の一つであるスピン流の生成には、強磁性体やスピン軌道相互作用(SOI)の強い重金属など限られた物質が用いられてきた。一方、SOIの弱い常磁性金属はスピン流の長距離伝搬が可能であるなどデバイス応用上の優位性を持つ。本研究は物質に依存しない普遍的な相互作用を利用したスピン流生成手法の開拓を目指す。

Outline of Final Research Achievements

In this research, we theoretically study the spin-related phenomena through dynamical lattice deformation. Remarkably, we derived a mechanism for converting magnetization into electromotive force due to a surface acoustic wave in a single ferromagnetic layer. The present mechanism can be realized in a simple layer without both precious metals and complicated device structure. Our finding opens the door for innovative applications using surface acoustic waves.
Based on these findings, we investigated the spin-orbit interaction induced by the curvature in nanotube systems. As a result, we successfully reproduced the curvature-dependent spin-orbit interaction in carbon nanotubes and discovered the valley-dependent spin splitting in silicon nanotubes.

Academic Significance and Societal Importance of the Research Achievements

電子の磁気的性質の流れであるスピン流は、電子デバイスの省エネルギー化や高機能化に革新をもたらすと期待されている。しかし、従来のスピン流生成は、電子スピンと電子の軌道運動が強く結合する貴金属が必須であった。本研究成果は、ナノチューブなど物質の格子(構造)の変形が電子スピンと軌道運動の結合を生み出すことを提供するものである。これはカーボンやシリコンなどの貴金属を必要としない新たなスピンデバイスへの可能性に繋がる。

Report

(3 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • Research Products

    (15 results)

All 2023 2022 Other

All Int'l Joint Research (1 results) Journal Article (5 results) (of which Int'l Joint Research: 4 results,  Peer Reviewed: 5 results) Presentation (7 results) (of which Int'l Joint Research: 2 results,  Invited: 2 results) Remarks (2 results)

  • [Int'l Joint Research] 中国科学院大学/カプリ理論科学研究所(中国)

    • Related Report
      2022 Annual Research Report
  • [Journal Article] Spin hydrodynamic generation in unsteady flows2023

    • Author(s)
      Funato Takumi、Matsuo Mamoru
    • Journal Title

      Journal of Magnetism and Magnetic Materials

      Volume: 572 Pages: 170574-170574

    • DOI

      10.1016/j.jmmm.2023.170574

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Acoustic spin transport by superconducting quasiparticles2022

    • Author(s)
      Funato Takumi、Yamakage Ai、Matsuo Mamoru
    • Journal Title

      Physical Review B

      Volume: 106 Issue: 21 Pages: 214420-214420

    • DOI

      10.1103/physrevb.106.214420

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Quantum transport of a spin-1 chiral fermion2022

    • Author(s)
      Kikuchi Risako、Funato Takumi、Yamakage Ai
    • Journal Title

      Physical Review B

      Volume: 106 Issue: 23 Pages: 235204-235204

    • DOI

      10.1103/physrevb.106.235204

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Spin pumping into anisotropic Dirac electrons2022

    • Author(s)
      Funato Takumi、Kato Takeo、Matsuo Mamoru
    • Journal Title

      Physical Review B

      Volume: 106 Issue: 14 Pages: 144418-144418

    • DOI

      10.1103/physrevb.106.144418

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Spin Elastodynamic Motive Force2022

    • Author(s)
      Funato Takumi、Matsuo Mamoru
    • Journal Title

      Physical Review Letters

      Volume: 128 Issue: 7 Pages: 077201-077201

    • DOI

      10.1103/physrevlett.128.077201

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] Spin elastodynamic motive force2023

    • Author(s)
      Takumi Funato and Mamoru Matsuo
    • Organizer
      AFM2023
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] s波超伝導体における表面弾性波を用いたスピン流生成2023

    • Author(s)
      船戸匠, 山影相, 松尾衛
    • Organizer
      日本物理学会 年次大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 磁化・渦度・伝導電子スピンの交差応答を用いたスピン流生成理論2023

    • Author(s)
      船戸匠, 松尾衛
    • Organizer
      Spin-RNJ Symposium 2022
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] Theory of Spin Elastodynamic Motive Force2022

    • Author(s)
      Takumi Funato and Mamoru Matsuo
    • Organizer
      ICMFS2022
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 表面弾性波を用いたヘリシティ流とスピン起電力2022

    • Author(s)
      船戸匠, 松尾衛
    • Organizer
      カイラル物質科学の新展開
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] ビスマスへの異方的スピンポンピング2022

    • Author(s)
      船戸匠, 加藤武生, 松尾衛
    • Organizer
      日本物理学会 秋季大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 表面弾性波によるスピン起電力2022

    • Author(s)
      船戸匠、松尾衛
    • Organizer
      日本物理学会
    • Related Report
      2021 Research-status Report
  • [Remarks] 慶應義塾大学理工学部能崎研究室ホームページ

    • URL

      http://www.phys.keio.ac.jp/guidance/labs/nozaki/

    • Related Report
      2021 Research-status Report
  • [Remarks] 慶應義塾大学・中国科学院大学共同プレスリリース

    • URL

      https://www.keio.ac.jp/ja/press-releases/2022/2/21/28-104329/

    • Related Report
      2021 Research-status Report

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Published: 2021-10-22   Modified: 2024-01-30  

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