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Microscopic study on the Gilbert damping constant for the inhomogeneous spin synamics

Research Project

Project/Area Number 16K06702
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Physical properties of metals/Metal-base materials
Research InstitutionTohoku University

Principal Investigator

SAKUMA Akimasa  東北大学, 工学研究科, 教授 (30361124)

Co-Investigator(Kenkyū-buntansha) 栂 裕太  国立研究開発法人物質・材料研究機構, 磁性・スピントロニクス材料研究拠点, NIMSポスドク研究員 (70641231)
三浦 大介  東北大学, 工学研究科, 助教 (90708455)
Project Period (FY) 2016-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2018: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2017: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2016: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Keywordsギルバート緩和 / スピン動力学 / 第一原理計算 / 遷移金属 / トルク相関法 / スピン軌道相互作用 / 異常ホール効果 / 結晶磁気異方性 / スピン流 / スピンポンピング / スピントルク
Outline of Final Research Achievements

We have theoretically studied the Gilbert damping in the magnetic systems having magnetic inhomogeneity such as multilayered structures and spin fluctuations. It is found, for the multilayer system, that the model calculation taking into account the spin currents at the interface give substantially the same results with those by the first principles calculation taking the whole electronic structure of multilayer system into account. This indicates that the spin pumping effects in the multilayered systems can be appropriately reflected in the torque correlation model proposed first by Kambersky. As for the cases with spin fluctuation, it promotes the inter-band transitions due to the electron scattering, resulting in the increase of Gilbert damping constant α.

Academic Significance and Societal Importance of the Research Achievements

磁気デバイスの高速動作と低消費電力には磁化回転に際してのスピンの緩和時間が大きく関わっている。一般にスピンの緩和定数は磁化の反転時間に深く関わり、さらに量子コンピュータにおいてはスピン才差運動の位相緩和時間にも関係していることから、その制御と起源についての関心が急速に高まってきている。本研究は(微小)強磁性体におけるスピン緩和の起源とその支配因子に関する理論研究であり、近年の磁気工学の課題解決に寄与し得るテーマである。

Report

(4 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • 2016 Research-status Report
  • Research Products

    (34 results)

All 2019 2018 2017 2016

All Journal Article (8 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 8 results,  Acknowledgement Compliant: 1 results) Presentation (26 results) (of which Int'l Joint Research: 10 results,  Invited: 1 results)

  • [Journal Article] Theoretical Study of Gilbert Damping Constants in Magnetic Multilayer Films2019

    • Author(s)
      Dai Ozaki, Daisuke Miura, Akimasa Sakuma
    • Journal Title

      IEEE TRANSACTION ON MAGNETICS

      Volume: 印刷中

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Theoretical Study of Gilbert Damping in Rare-Earth Permanent Magnets2019

    • Author(s)
      Fumiya Saito, Daisuke Miura, and Akimasa Sakuma
    • Journal Title

      IEEE TRANSACTION ON MAGNETICS

      Volume: 印刷中 Issue: 7 Pages: 1-4

    • DOI

      10.1109/tmag.2019.2892493

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] emperature Dependence of Anomalous Hall Conductivity in Rashba-type Ferromagnets2018

    • Author(s)
      Akimasa Sakuma
    • Journal Title

      J. Phys. Soc. Jpn.

      Volume: 87 Issue: 3 Pages: 034705-034705

    • DOI

      10.7566/jpsj.87.034705

    • Related Report
      2018 Annual Research Report 2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] First principles calculation for Gilbert damping constants in ferromagnetic/non-magnetic junctions2018

    • Author(s)
      R. Hiramatsu, D. Miura, and A. Sakuma
    • Journal Title

      AIP Advances

      Volume: 8 Issue: 5 Pages: 056016-056016

    • DOI

      10.1063/1.5007255

    • NAID

      130006708732

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Theoretical study on the perpendicular anisotropic magnetoresistance using Rashba-type ferromagnetic model2018

    • Author(s)
      Y. Yahagi, D. Miura, and A. Sakuma
    • Journal Title

      AIP Advances

      Volume: 8 Issue: 5 Pages: 055822-055822

    • DOI

      10.1063/1.5007179

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] First-principles evaluation of intrinsic, side-jump, and skew-scattering parts of anomalous Hall conductivities in disordered alloys2016

    • Author(s)
      K. Hyodo, A. Sakuma, Y. Kota
    • Journal Title

      Phys. Rev. B

      Volume: 94 Issue: 10

    • DOI

      10.1103/physrevb.94.104404

    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Effects of spin fluctuation on the magnetic anisotropy constant of itinerant electron magnets2016

    • Author(s)
      Naofumi Kobayashi, Kazushige Hyodo, and Akimasa Sakuma
    • Journal Title

      Jpn. J. Appl. Phys.

      Volume: 55 Issue: 10 Pages: 100306-100306

    • DOI

      10.7567/jjap.55.100306

    • NAID

      210000147113

    • Related Report
      2016 Research-status Report
    • Peer Reviewed
  • [Journal Article] Influence of L10 order parameter on Gilbert damping constants for FePd thin films investigated by means of time-resolved magneto-optical Kerr effect2016

    • Author(s)
      Satoshi Iihama, Akimasa Sakuma, Hiroshi Naganuma, Mikihiko Oogane, Shigemi Mizukami, and Yasuo Ando
    • Journal Title

      Physical Review B

      Volume: 94 Issue: 17 Pages: 1744251-11

    • DOI

      10.1103/physrevb.94.174425

    • Related Report
      2016 Research-status Report
    • Peer Reviewed
  • [Presentation] Theoretical Study of Gilbert Damping in Magnetic Multilayer Film2019

    • Author(s)
      D. Ozaki, D. Miura, A. Sakuma
    • Organizer
      2019 Joint MMM-Intermag Conference
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Theoretical Study of Gilbert Damping in Rare-Earth Permanent2019

    • Author(s)
      F. Saito, D. Miura, A. Sakuma
    • Organizer
      2019 Joint MMM-Intermag Conference
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 接合系におけるギルバート緩和定数の第一原理計算2019

    • Author(s)
      平松 諒也,三浦大介,佐久間昭正
    • Organizer
      日本物理学会74回年次大会
    • Related Report
      2018 Annual Research Report
  • [Presentation] ハーフメタルにおけるギルバート緩和定数の第一原理計算2019

    • Author(s)
      白木原 覚,三浦大介,佐久間昭正
    • Organizer
      日本物理学会74回年次大会
    • Related Report
      2018 Annual Research Report
  • [Presentation] 強磁性金属における光誘起スピン蓄積に関する理論研究2019

    • Author(s)
      尾崎太飛,三浦大介,佐久間昭正
    • Organizer
      日本物理学会74回年次大会
    • Related Report
      2018 Annual Research Report
  • [Presentation] 異方性磁気抵抗効果の対称性に関する理論研究2019

    • Author(s)
      矢作 裕太,三浦大介,佐久間昭正
    • Organizer
      日本物理学会74回年次大会
    • Related Report
      2018 Annual Research Report
  • [Presentation] 外部電場存在下のRashba系を媒体とする有効相互作用に関する理論研究2019

    • Author(s)
      大金 幸平,矢作 裕太,三浦大介,佐久間昭正
    • Organizer
      日本物理学会74回年次大会
    • Related Report
      2018 Annual Research Report
  • [Presentation] 磁性多層膜のギルバート緩和定数に関する理論研究2018

    • Author(s)
      尾崎太飛,三浦大介,佐久間昭正
    • Organizer
      日本物理学会2018年秋季大会
    • Related Report
      2018 Annual Research Report
  • [Presentation] 界面ラフネスを考慮した強磁性/非磁性接合系におけるギルバート緩和定数の第一原理計算2018

    • Author(s)
      平松 諒也,三浦大介,佐久間昭正
    • Organizer
      日本物理学会2018年秋季大会
    • Related Report
      2018 Annual Research Report
  • [Presentation] 希土類磁石におけるGilbert緩和に関する理論研究2018

    • Author(s)
      齋藤史弥,三浦大介,佐久間昭正
    • Organizer
      日本物理学会2018年秋季大会
    • Related Report
      2018 Annual Research Report
  • [Presentation] ラシュバ系における 異方性磁気抵抗効果の 微視的理論2018

    • Author(s)
      矢作 裕太,三浦大介,佐久間昭正
    • Organizer
      日本物理学会2018年秋季大会
    • Related Report
      2018 Annual Research Report
  • [Presentation] 磁性多層膜におけるスピン軌道トルクに関する理論研究2018

    • Author(s)
      金 世勲、矢作 裕太,三浦大介,佐久間昭正
    • Organizer
      日本物理学会2018年秋季大会
    • Related Report
      2018 Annual Research Report
  • [Presentation] Theoretical Study of Gilbert Damping Constants on Magnetic Multi-layers2018

    • Author(s)
      Dai Ozaki, Daisuke Miura, Akimasa Sakuma
    • Organizer
      Kick-off Symposium for World Leading Research Centers -Materials Science and Spintronics-
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Theoretical study of the unconventional anisotropic magnetoresistance using Rashba-type ferromagnetic model2018

    • Author(s)
      Yuta Yahagi, Daisuke Miura, Akimasa Sakuma
    • Organizer
      Kick-off Symposium for World Leading Research Centers -Materials Science and Spintronics-
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] First principles calculation for Gilbert damping constants in ferromagnetic/non-magnetic junctions2018

    • Author(s)
      Ryoya Hiramatsu, Daisuke Miura, Akimasa Sakuma
    • Organizer
      Kick-off Symposium for World Leading Research Centers -Materials Science and Spintronics-
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] 磁性多層膜におけるGilbert緩和定数2018

    • Author(s)
      尾崎太飛,三浦大介,佐久間昭正
    • Organizer
      日本物理学会73回年次大会
    • Related Report
      2017 Research-status Report
  • [Presentation] ラッシュバ型強磁性体における非従来型異方性磁気抵抗効果の理論計算2018

    • Author(s)
      矢作 裕太,三浦大介,佐久間昭正
    • Organizer
      日本物理学会73回年次大会
    • Related Report
      2017 Research-status Report
  • [Presentation] 磁性体接合系におけるギルバート緩和定数の第一原理計算2018

    • Author(s)
      平松 諒也,三浦大介,佐久間昭正
    • Organizer
      日本物理学会73回年次大会
    • Related Report
      2017 Research-status Report
  • [Presentation] 遷移金属におけるスピン揺らぎを考慮したGilbert緩和定数の第一原理計算2017

    • Author(s)
      尾崎 太飛、平松 諒也、三浦 大介、佐久間 昭正
    • Organizer
      日本物理学会72回年次大会
    • Place of Presentation
      大阪大学(大阪市)
    • Year and Date
      2017-03-17
    • Related Report
      2016 Research-status Report
  • [Presentation] フェリ磁性体におけるマグノンが関与するスピン流の微視的記述2017

    • Author(s)
      熊本 達也、三浦 大介、佐久間 昭正
    • Organizer
      日本物理学会72回年次大会
    • Place of Presentation
      大阪大学(大阪市)
    • Year and Date
      2017-03-17
    • Related Report
      2016 Research-status Report
  • [Presentation] 強磁性/非磁性接合系におけるギルバート緩和定数の第一原理計算2017

    • Author(s)
      平松 諒也、尾崎 太飛、三浦 大介、佐久間 昭正
    • Organizer
      日本物理学会72回年次大会
    • Place of Presentation
      大阪大学(大阪市)
    • Year and Date
      2017-03-17
    • Related Report
      2016 Research-status Report
  • [Presentation] First-principles study on intrinsic and extrinsic anomalous Hall conductivity of transition metal alloys2017

    • Author(s)
      K. Hyodo and A. Sakuma
    • Organizer
      Internanational workshop on computational science 2017 "Design of Novel Magnetic Materials for Device Applications: Simulation and Experiment"
    • Place of Presentation
      金沢大学(金沢市)
    • Year and Date
      2017-02-17
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] First-Principles Study on the Magnetic Damping of Transition Metals in the Presence of Spin Fluctuiation2017

    • Author(s)
      D. Ozaki, D. Miura, A. Sakuma
    • Organizer
      2017 Intermag Conference
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] First principles calculations for Gilbert damping constants in ferromagnetic/non-magnetic junctions2017

    • Author(s)
      R. Hiramatsu, D. Miura, A. Sakuma
    • Organizer
      62nd Annual Conference on Magnetism and Magnetic Materials
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Theoretical study on the perpendicular anisotropic magnetoresistance using Rashba-type ferromagnetic model2017

    • Author(s)
      Y. Yahagi, D. Miura, A. Sakuma
    • Organizer
      62nd Annual Conference on Magnetism and Magnetic Materials
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Theoretical study of spin currents in ferrimagnet2016

    • Author(s)
      Tatsuya Kumamoto, Daisuke Miura and Akimasa Sakuma
    • Organizer
      61st Annual Conference on Magnetism and Magnetic Materials
    • Place of Presentation
      New Orleans
    • Year and Date
      2016-10-31
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research

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Published: 2016-04-21   Modified: 2020-03-30  

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