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2020 Fiscal Year Annual Research Report

Unified theory of electromagnetic and optical cross correlation phenomena in solids

Research Project

Project/Area Number 17H02929
Research InstitutionInstitute of Physical and Chemical Research

Principal Investigator

多々良 源  国立研究開発法人理化学研究所, 創発物性科学研究センター, チームリーダー (10271529)

Co-Investigator(Kenkyū-buntansha) 河野 浩  名古屋大学, 理学研究科, 教授 (10234709)
Project Period (FY) 2017-04-01 – 2021-03-31
Keywordsスピントロニクス / マグノン / 磁壁
Outline of Annual Research Achievements

有効ゲージ場の記述は磁性体中の構造のダイナミクスの記述に役立つ。本年度は、強磁性体反強磁性体の2つの場合に磁壁の運動に伴うスピン波放出の問題をこの観点から理論的に解析した。まず強磁性体の場合に、磁壁構造の周りのゆらぎをゲージ場導出と同じように回転座標系に移って記述し、磁壁の集団座標とスピン波の結合を書き下した。集団座標は従来よく考えられていた磁壁の位置、角度に加えて厚さという変数を新しく取り込んだ。その結果厚さの時間変動モードは強いスピン波放出を伴い、強いオーミックな散逸を生じる過程となっていることがわかった。これに対して位置や角度の時間変化はエネルギーを伴わないゼロモードに近いモードであるためスピン波放出と散逸への寄与は弱い。反強磁性体の場合にはよく知られているようにスピン波は相対論的なモードになっているためにスピン波放出の挙動は大きく変わることが期待される。磁壁周りのゆらぎを解析した結果、スピン波のペア生成/吸収が運動している磁壁が起こす主要な効果であることがわかった。静止状態ではマグノンギャップなどできまる有限エネルギーがスピン波生成には必要でありこのことはペア生成/吸収の確率を表す応答関数が低エネルギー成分を持たないことで表される。これに対して運動している磁壁の場合には応答関数が運動系へのローレンツブーストされたことで低エネルギー成分をもち、このためにスピン波ペア放出過程が可能となることがわかった。このことは運動系における真空の不安定性によるペア生成という意味を持ち、強電場真空中での電子反電子ペア生成(Schwinger効果)の磁性体版となっている。ペア生成効果は磁壁の速度が有効的な光速に近づくにしたがい急激に増大する。スピン波放出による散逸効果も解析した。

Research Progress Status

令和2年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

令和2年度が最終年度であるため、記入しない。

  • Research Products

    (22 results)

All 2022 2021 2020 Other

All Int'l Joint Research (4 results) Journal Article (18 results) (of which Int'l Joint Research: 10 results,  Peer Reviewed: 18 results,  Open Access: 7 results)

  • [Int'l Joint Research] Donostia International Physics Center(スペイン)

    • Country Name
      SPAIN
    • Counterpart Institution
      Donostia International Physics Center
  • [Int'l Joint Research] Hitachi Cambridge Laboratory,(英国)

    • Country Name
      UNITED KINGDOM
    • Counterpart Institution
      Hitachi Cambridge Laboratory,
  • [Int'l Joint Research] Inst. Phys. Microstructures RAS/Univ. of Nizhny Novgorod(ロシア連邦)

    • Country Name
      RUSSIA FEDERATION
    • Counterpart Institution
      Inst. Phys. Microstructures RAS/Univ. of Nizhny Novgorod
  • [Int'l Joint Research] AUST(ナイジェリア)

    • Country Name
      NIGERIA
    • Counterpart Institution
      AUST
  • [Journal Article] [1]Spin Hall Response at Finite Wave Vector in Ferromagnets2022

    • Author(s)
      Tatara Gen
    • Journal Title

      J. Phys. Soc. Jpn

      Volume: 91 Pages: 034705(1-6)

    • DOI

      10.7566/JPSJ.91.034705

    • Peer Reviewed / Open Access
  • [Journal Article] Slater-Pauling behavior of interfacial magnetic properties of transition metal alloy/Pt structures2022

    • Author(s)
      Kim Nam-Hui、Qurat-ul-ain、Kim Joonwoo、Baek Eunchong、Kim June-Seo、Park Hyeon-Jong、Kohno Hiroshi、Lee Kyung-Jin、Rhim Sonny H.、Lee Hyun-Woo、You Chun-Yeol
    • Journal Title

      Physical Review B

      Volume: 105 Pages: 064403

    • DOI

      10.1103/PhysRevB.105.064403

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Hydrodynamic theory of vorticity-induced spin transport2021

    • Author(s)
      Tatara Gen
    • Journal Title

      Physical Review B

      Volume: 104 Pages: 184414(1-13)

    • DOI

      10.1103/PhysRevB.104.184414

    • Peer Reviewed
  • [Journal Article] Vorticity-induced anomalous Hall effect in an electron fluid2021

    • Author(s)
      Funaki Hiroshi、Toshio Riki、Tatara Gen
    • Journal Title

      Physical Review Research

      Volume: 3 Pages: 033075(1-9)

    • DOI

      10.1103/PhysRevResearch.3.033075

    • Peer Reviewed / Open Access
  • [Journal Article] Hydrodynamic theory of chiral angular momentum generation in metals2021

    • Author(s)
      Funaki Hiroshi、Tatara Gen
    • Journal Title

      Physical Review Research

      Volume: 3 Pages: 023160(9pages)

    • DOI

      10.1103/PhysRevResearch.3.023160

    • Peer Reviewed / Open Access
  • [Journal Article] Topologically-mediated energy release by relativistic antiferromagnetic solitons2021

    • Author(s)
      Otxoa R. M.、Rama-Eiroa R.、Roy P. E.、Tatara G.、Chubykalo-Fesenko O.、Atxitia U.
    • Journal Title

      Physical Review Research

      Volume: 3 Pages: 043069(1-9)

    • DOI

      10.1103/PhysRevResearch.3.043069

    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Thermal Spin Torque in Double-Barrier Tunnel Junctions with Magnetic Insulators2021

    • Author(s)
      Ortiz Pauyac Christian、Akosa Collins Ashu、Tatara Gen、Chshiev Mairbek、Kalitsov Alan
    • Journal Title

      Physical Review Applied

      Volume: 15 Pages: 064003(11pages)

    • DOI

      10.1103/PhysRevApplied.15.064003

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Current-Induced Spin-Wave Doppler Shift in Antiferromagnets2021

    • Author(s)
      Nakane Jotaro J.、Kohno Hiroshi
    • Journal Title

      Journal of the Physical Society of Japan

      Volume: 90 Pages: 103705~103705

    • DOI

      10.7566/JPSJ.90.103705

    • Peer Reviewed
  • [Journal Article] Microscopic calculation of spin torques in textured antiferromagnets2021

    • Author(s)
      Nakane Jotaro J.、Kohno Hiroshi
    • Journal Title

      Physical Review B

      Volume: 103 Pages: L180405

    • DOI

      10.1103/PhysRevB.103.L180405

    • Peer Reviewed
  • [Journal Article] Spin-orbit torques and magnetotransport of two-dimensional Dirac electrons without particle-hole symmetry2021

    • Author(s)
      Imai Yusuke、Yamakage Ai、Kohno Hiroshi
    • Journal Title

      Physical Review B

      Volume: 103 Pages: 144416

    • DOI

      10.1103/PhysRevB.103.144416

    • Peer Reviewed
  • [Journal Article] Magnetic-Field-Driven Antiferromagnetic Domain Wall Motion2021

    • Author(s)
      Nakane Jotaro J.、Kohno Hiroshi
    • Journal Title

      Journal of the Physical Society of Japan

      Volume: 90 Pages: 034702~034702

    • DOI

      10.7566/JPSJ.90.034702

    • Peer Reviewed
  • [Journal Article] Magnon pair emission from a relativistic domain wall in antiferromagnets2020

    • Author(s)
      Tatara Gen、Akosa Collins Ashu、Otxoa de Zuazola Ruben M.
    • Journal Title

      Physical Review Research

      Volume: 2 Pages: 043226(1-17)

    • DOI

      10.1103/PhysRevResearch.2.043226

    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Collective coordinate study of spin-wave emission from a dynamic domain wall2020

    • Author(s)
      Tatara Gen、Otxoa de Zuazola Ruben M.
    • Journal Title

      Physical Review B

      Volume: 101 Pages: 224425(1-9)

    • DOI

      10.1103/PhysRevB.101.224425

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Skew-scattering-induced giant antidamping spin-orbit torques: Collinear and out-of-plane Edelstein effects at two-dimensional material/ferromagnet interfaces2020

    • Author(s)
      Sousa Frederico、Tatara Gen、Ferreira Aires
    • Journal Title

      Physical Review Research

      Volume: 2 Pages: 043401(1-10)

    • DOI

      10.1103/PhysRevResearch.2.043401

    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Current-driven nucleation and propagation of antiferromagnetic skyrmionium2020

    • Author(s)
      Obadero S. A.、Yamane Y.、Akosa C. A.、Tatara G.
    • Journal Title

      Physical Review B

      Volume: 102 Pages: 014458(1-8)

    • DOI

      10.1103/PhysRevB.102.014458

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Nonlinear Control of Damping Constant by Electric Field in Ultrathin Ferromagnetic Films2020

    • Author(s)
      Rana Bivas、Akosa Collins Ashu、Miura Katsuya、Takahashi Hiromasa、Tatara Gen、Otani YoshiChika
    • Journal Title

      Physical Review Applied

      Volume: 14 Pages: 014037(1-14)

    • DOI

      10.1103/PhysRevApplied.14.014037

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Optical response of ferromagnetic materials induced by a spin gauge field at the second order2020

    • Author(s)
      Karashtin E.、Tatara Gen
    • Journal Title

      Physical Review B

      Volume: 101 Pages: 174439(1-8)

    • DOI

      10.1103/PhysRevB.101.174439

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Topological Hall signatures of magnetic hopfions2020

    • Author(s)
      Borge Gobel、Akosa Collins Ashu、Tatara Gen、Mertig Ingrid
    • Journal Title

      Physical Review Research

      Volume: 2 Pages: 013315(1-6)

    • DOI

      10.1103/PhysRevResearch.2.013315

    • Peer Reviewed / Open Access / Int'l Joint Research

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Published: 2022-12-28  

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