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Active controll of the magnetization damping by electric field effect in magnetic metal

Research Project

Project/Area Number 19K15437
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 29010:Applied physical properties-related
Research InstitutionNihon University

Principal Investigator

KASATANI Yuichi  日本大学, 理工学部, 研究員 (30836507)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2020: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2019: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Keywords磁化緩和機構 / ダンピング定数 / 強磁性共鳴 / 磁気光学効果 / 電界効果 / 異常ネルンスト効果 / スピントロニクス
Outline of Research at the Start

磁化(電子スピン)を情報伝達に利用するスピントロニクスデバイスの高性能化に向けて、磁性体中での磁化の緩和機構を制御することが必要不可欠である。本研究では、磁化緩和機構を特徴づけるダンピング定数の、材料やデバイス構造などによる決定論的な制御ではなく、ゲート電圧による能動的・系統的制御を目指す。超短パルスレーザーを用いた超高時間分解磁気光学測定による実空間における磁化挙動の追跡と、コプレーナ導波路を用いた強磁性共鳴法による周波数領域でのダンピング定数の精密測定により、磁化緩和機構における電界効果の影響を多角的に究明する。

Outline of Final Research Achievements

The goal of this study is active control of the magnetization relaxation mechanism by external parameters such as voltage. The measurement system and the sputtering machine were newly set up. Distinct change of the magnetization relaxation mechanism was not observed with applying the voltage. It is suggested that sample structure and voltage intensity are important to control the damping constant. Since it was difficult to prepare new samples due to the breakdown of the sputtering machine, I have changed original plan and investigated the thermomagnetic effect in rare earth-transition metal ferrimagnetic alloys. By applying a temperature gradient to the Gd-Fe alloy ferrimagnetic thin film, I found that anomalous Nernst effects occur in wide range of composition ratio. I also qualitatively found that the magnitude and polarity of the anomalous Nernst voltage changes sensitively in response to the dominant sublattice elements with changing the composition ratio.

Academic Significance and Societal Importance of the Research Achievements

本研究で得られた成果の学術的意義は、時間領域と周波数領域の両方の観点から磁化緩和機構を複合的に捉え、変化中の過渡状態と結果としてのパラメータ変化から電子状態と磁化緩和機構の関係に深くアプローチすることを可能にした。また、広範な合金組成の希土類―遷移金属合金フェリ磁性体で異常ネルンスト効果が生じ、その大きさや極性の組成・温度依存性を示した。社会的意義としては、磁化緩和機構の能動的制御指針を示すことでデバイス応用への可能性を見出した。さらに、近年注目されている熱磁気効果をデバイス応用する上で、希土類―遷移金属フェリ磁性体を用いることによって比較的容易な特性制御の可能性を示したと言える。

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (9 results)

All 2022 2021 2020 2019

All Presentation (9 results) (of which Int'l Joint Research: 5 results)

  • [Presentation] GdFeフェリ磁性薄膜における温度勾配に起因する横電圧誘起と横ゼーベック係数2022

    • Author(s)
      小林 祐希, 笠谷 雄一, 塚本 新
    • Organizer
      第69回応用物理学会春季学術講演会
    • Related Report
      2021 Annual Research Report
  • [Presentation] GdFeCoフェリ磁性合金薄膜における全光型磁化反転の電気的検出と電流制御2021

    • Author(s)
      笠谷雄一, 吉川大貴, 塚本 新
    • Organizer
      電気学会 マグネティックス研究会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Electrical detection and modulation of All-Optical magnetization Switching in GdFeCo ferrimagnetic alloy2020

    • Author(s)
      Y. Kasatani, H. Yoshikawa, and A. Tsukamoto
    • Organizer
      New Perspective in Spin Conversion Science (NPSCS2020)
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Electrical Detection of Single Shot All-Optical Magnetization Switching in Ferrimagnetic GdFeCo Alloy2019

    • Author(s)
      Y. Kasatani, H. Yoshikawa, and A. Tsukamoto
    • Organizer
      Magnetics and Optics Research International Symposium 2019 (MORIS2019)
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Electrical detection of all-optical magnetization switching in ferrimagnetic GdFeCo alloy by anomalous Hall effect2019

    • Author(s)
      Y. Kasatani, H. Yoshikawa, and A. Tsukamoto
    • Organizer
      Materials Research Meeting 2019 (MRM2019)
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] GdFeCoフェリ磁性体合金における全光型磁化反転交番誘起の異常ホール効果による電気的検出2019

    • Author(s)
      笠谷雄一, 吉川大貴, 塚本新
    • Organizer
      第43回日本磁気学会学術講演会
    • Related Report
      2019 Research-status Report
  • [Presentation] All-Optical Magnetization Switching In GdFeCo on Electronic Heat Conversion Layers2019

    • Author(s)
      H. Yoshikawa, Y. Kasatani, and A. Tsukamoto
    • Organizer
      Magnetics and Optics Research International Symposium 2019 (MORIS2019)
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Thickness dependency of GdFeCo films and All-optical magnetization switching phenomena2019

    • Author(s)
      H. Yoshikawa, Y. Kasatani, and A. Tsukamoto
    • Organizer
      New Perspective in Spin Conversion Science (NPSCS2020)
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] GdFe 系合金薄膜を用いたホール素子作製への検討2019

    • Author(s)
      森敦司, 笠谷雄一 ,塚本新
    • Organizer
      第43回日本磁気学会学術講演会
    • Related Report
      2019 Research-status Report

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Published: 2019-04-18   Modified: 2023-01-30  

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