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Realization of low-magnetostriction and low-magnetic noise in Heusler alloy based giant magnetoresistive sensors

Research Project

Project/Area Number 20K04588
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 21050:Electric and electronic materials-related
Research InstitutionNational Institute for Materials Science

Principal Investigator

NAKATANI Tomoya  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, 主任研究員 (60782646)

Co-Investigator(Kenkyū-buntansha) 遠藤 恭  東北大学, 工学研究科, 教授 (50335379)
Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2022: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2021: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2020: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Keywords磁気センサ / 磁気抵抗 / 磁性材料 / ノイズ / トンネル磁気抵抗 / 巨大磁気抵抗 / ホイスラー合金 / 磁歪 / 磁気ダンピング / 磁気記録 / 軟磁性材料
Outline of Research at the Start

ハードディスクの再生ヘッドなど、ナノスケールの磁気センサの高感度化のためには、面直電流巨大磁気抵抗素子の高性能化が重要である。過去の研究により、強磁性材料としてホイスラー合金を用いることで、高い磁気抵抗比(センサの出力)が実現されてきたが、再生ヘッドの実現には、磁歪(磁気弾性効果)の制御と磁気ノイズの抑制が不可欠である。本研究では、磁歪と磁気ダンピング定数(磁気ノイズに直結)を決定する材料要素、すなわち合金組成と結晶構造についての系統的な調査を実施する。

Outline of Final Research Achievements

We have developed ferromagnetic thin film materials for the realization of read heads for hard disk drives and magnetic sensors for ultra-small magnetic field detection. For the read head application, we obtained the optimal composition of Co2(Mn,Fe)Ge Heusler alloy thin film in terms of magnetostriction, magnetic damping and magnetoresistance. For ultra-sensitive magnetic sensor application, we developed tunnel magnetoresistive sensors with soft magnetic and low noise characteristics. We also conducted thorough investigations on the effect of AC magnetic field modulation on the 1/f noise in the tunnel magnetoresistive sensors.

Academic Significance and Societal Importance of the Research Achievements

高性能な磁気センサは磁気記録、車載・産業用途から、医療・健康に関わるさまざまな分野に必要である。本研究では、磁気記録用再生ヘッドと、生体磁気計測を目指した超高感度磁気センサを出口にターゲットとして、磁気抵抗素子の出力・感度の増大とノイズの低減を実現するための強磁性薄膜材料を開発した。またノイズ低減法として期待される交流磁界変調法の、センサのノイズ特性に与える効果を解明し、今後の磁気センサ研究の方向性を与えた。

Report

(4 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (13 results)

All 2023 2022 2021 2020

All Journal Article (4 results) (of which Peer Reviewed: 4 results) Presentation (5 results) (of which Int'l Joint Research: 2 results,  Invited: 1 results) Book (1 results) Patent(Industrial Property Rights) (3 results)

  • [Journal Article] Tunnel magnetoresistance sensors with symmetric resistance-field response and noise properties under AC magnetic field modulation2022

    • Author(s)
      Tomoya Nakatani, Hirofumi Suto, Prabhanjan D. Kulkarni, Hitoshi Iwasaki, and Yuya Sakuraba
    • Journal Title

      Applied Physics Letters

      Volume: 121 Issue: 19 Pages: 192406-192406

    • DOI

      10.1063/5.0119677

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Tunnel magnetoresistance sensors with dual soft-pinned free layers exhibiting highly symmetric resistance-field response curves2022

    • Author(s)
      Tomoya Nakatani, and Hitoshi Iwasaki
    • Journal Title

      Journal of Applied Physics

      Volume: 132 Pages: 223904-223904

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Effects of (Ni0.8Fe0.2)100-xCrx seed layer on microstructure, magnetic properties, and giant magnetoresistance of [FeCoNi/Cu] multilayer films2021

    • Author(s)
      P.D. Kulkarni, T. Nakatani, T. Sasaki, and Y. Sakuraba
    • Journal Title

      Journal of Applied Physics

      Volume: 129 Issue: 21 Pages: 213901-213901

    • DOI

      10.1063/5.0054264

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Thickness dependence of degree of B2 order of polycrystalline Co2(Mn0.6Fe0.4)Ge Heusler alloy measured by anomalous X-ray diffraction and its impacts on current-perpendicular-to-plane giant magnetoresistance properties2020

    • Author(s)
      T. Nakatani, S. K. Narayananellore, L. S. R. Kumara, H. Tajiri, Y. Sakuraba, K. Hono
    • Journal Title

      Scripta Materialia

      Volume: 189 Pages: 63-66

    • DOI

      10.1016/j.scriptamat.2020.08.002

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Presentation] Noise characteristics of tunnel magnetoresistance sensors under AC modulation field2023

    • Author(s)
      中谷友也、首藤浩文、Prabhanjan D. Kulkarni、岩崎仁志、桜庭裕弥
    • Organizer
      2023年応用物理学会秋季学術講演会
    • Related Report
      2022 Annual Research Report
  • [Presentation] AC magnetic field modulation on tunnel magnetoresistance sensors with even-function resistance-field response2023

    • Author(s)
      中谷友也、首藤浩文、Prabhanjan D. Kulkarni、岩崎仁志、桜庭裕弥
    • Organizer
      Intermag 2022
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] FeCoNi/Cu多層膜GMRにおけるNiFeCr下地層組成の効果2022

    • Author(s)
      Prabhanjan D. Kulkarni,中谷友也,Zehao Li, 佐々木泰祐,桜庭裕弥
    • Organizer
      第46回 日本磁気学会学術講演会
    • Related Report
      2022 Annual Research Report
  • [Presentation] HDD再生ヘッド技術の将来展望2022

    • Author(s)
      中谷友也
    • Organizer
      日本磁気学会 第8回 岩崎コンファレンス
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] The compositional dependence of NiFeCr seed layer on giant magnetoresistance of [FeCoNi/Cu] multilayers2022

    • Author(s)
      P. D. Kulkarni, T. Nakatani, Y. Sakuraba
    • Organizer
      15th Joint MMM-Intermag Conference
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Book] スピントロニクスハンドブック2023

    • Author(s)
      中谷友也
    • Total Pages
      7
    • Publisher
      (株)エヌ・ティー・エス
    • ISBN
      9784860438425
    • Related Report
      2022 Annual Research Report
  • [Patent(Industrial Property Rights)] 磁気センサ2022

    • Inventor(s)
      クルカルニ プラバンジャン ディリプ、岩崎仁志、中谷友也
    • Industrial Property Rights Holder
      国立研究開発法人物質・材料研究機構
    • Industrial Property Rights Type
      特許
    • Industrial Property Number
      2022-065484
    • Filing Date
      2022
    • Related Report
      2022 Annual Research Report
  • [Patent(Industrial Property Rights)] 磁気接合、TMR素子、TMR素子アレイ、及びこれらを用いた磁気センサ、並びにこれらを用いたリニアエンコーダ用磁気センサ又は磁気式ロータリーエンコーダ2022

    • Inventor(s)
      中谷友也、岩崎仁志
    • Industrial Property Rights Holder
      国立研究開発法人物質・材料研究機構
    • Industrial Property Rights Type
      特許
    • Industrial Property Number
      2022-127029
    • Filing Date
      2022
    • Related Report
      2022 Annual Research Report
  • [Patent(Industrial Property Rights)] TMR素子を用いた磁気センサ、並びにこれを用いたリニアエンコーダ用 磁気センサ又は磁気式ロータリーエンコーダ2022

    • Inventor(s)
      岩崎仁志、中谷友也
    • Industrial Property Rights Holder
      国立研究開発法人物質・材料研究機構
    • Industrial Property Rights Type
      特許
    • Industrial Property Number
      2022-204231
    • Filing Date
      2022
    • Related Report
      2022 Annual Research Report

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Published: 2020-04-28   Modified: 2024-01-30  

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