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Giant magneto-resistance at Heusler alloy / conductive oxide junction and application to magnetic sensors

Research Project

Project/Area Number 18K13793
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
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)

Project Period (FY) 2018-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2019: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2018: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Keywords巨大磁気抵抗効果 / ホイスラー合金 / スピン依存伝導 / 自己組織化 / 巨大磁気抵抗 / 磁気ヘッド / 磁気センサ / 非磁性スペーサー / スピントロニクス / 磁気記録
Outline of Final Research Achievements

We studied current-perpendicular-to-plane giant magnetoresistance (CPP-GMR) systems composed of ferromagnetic Heusler alloys and nonmagnetic metal-conductive oxide composite spacers. We achieved the highest ever-reported CPP-GMR ratio above 50% using practical polycrystalline device structures with a Ag-In-Zn-O spacer precursor material. We elucidated the origin of this large CPP-GMR effect to be due to current-confinement through nano-sized Ag metallic paths distributed in MnO maritx formed by reduction-oxidation reaction between the Ag-In-Zn-O precursor and Mn in the CoMnFeGe Heusler alloy. This result has opened up a new way to create nanocomposite spacer for CPP-GMR through self-organization by reduction-oxidation reaction, and the achieved large CPP-GMR effect is important for magnetic read sensor application for hard disk drives.

Academic Significance and Societal Importance of the Research Achievements

本研究の主な学術的意義は、スピントロニクス素子において過去にほとんど報告のない、酸化還元反応によるナノコンポジットの自己組織化により、高い磁気抵抗効果が得られることを見出した点である。スピントロニクス素子に限らず、磁性材料においてナノ組織の制御の観点で、今後酸化還元反応が利用されることが期待される。また、本件で得られた高い磁気抵抗効果は、ハードディスクの再生ヘッドセンサとして応用されることが期待される。

Report

(3 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • Research Products

    (12 results)

All 2020 2019 2018 Other

All Int'l Joint Research (1 results) Journal Article (2 results) (of which Peer Reviewed: 2 results) Presentation (7 results) (of which Int'l Joint Research: 4 results) Book (1 results) Patent(Industrial Property Rights) (1 results)

  • [Int'l Joint Research] Western Digital Corporation(米国)

    • Related Report
      2019 Annual Research Report
  • [Journal Article] Improved current-perpendicular-to-plane giant magnetoresistance outputs by heterogeneous Ag-In:Mn-Zn-O nanocomposite spacer layer prepared from Ag-In-Zn-O precursor2019

    • Author(s)
      T. Nakatani, T. T. Sasaki, Y. Sakuraba, and K. Hono
    • Journal Title

      J. Appl. Phys

      Volume: 126 Issue: 17 Pages: 173904-173904

    • DOI

      10.1063/1.5127176

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] The microstructural origin of the enhanced current-perpendicular-to-the-plane giant magnetoresistance by Ag/In-Zn-O/Zn spacer layer2018

    • Author(s)
      T. Nakatani, T. T. Sasaki, S. Li, Y. Sakuraba, T. Furubayashi, K. Hono
    • Journal Title

      Journal of Applied Physics

      Volume: 124 Issue: 22 Pages: 223904-223904

    • DOI

      10.1063/1.5063548

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Presentation] Nano-scale magnetic sensors with Heusler alloy based-CPP-GMR devices2019

    • Author(s)
      T. Nakatani, S. K. Narayananellore, T. T. Sasaki, Y. Sakuraba, K. Hono
    • Organizer
      Magnetic Frontiers: Magnetic Sensors
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Ag-In:Mn-Zn-O ナノコンポジットスペーサーを有する CPP-GMR 素子の微細構造とスピン依存伝導2019

    • Author(s)
      中谷友也、佐々木泰祐、桜庭裕弥、宝野和博
    • Organizer
      日本磁気学会第43回学術講演会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Analysis of the spin-dependent transport in CPP-GMR devices with self-organized Ag-In:Mn-Zn-O nanocomposite spacer2019

    • Author(s)
      T. Nakatani, T. T. Sasaki, Y. Sakuraba, K. Hono
    • Organizer
      64th Annual Conference on Magnetism and Magnetic Materials (MMM 2019)
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Enhancement of CPP-GMR ratio by Ag-In-Zn-O precursor for spacer layer2019

    • Author(s)
      中谷友也
    • Organizer
      応用物理学会
    • Related Report
      2018 Research-status Report
  • [Presentation] Nano-scale magnetic sensors with Heusler alloy based-CPP-GMR devices2019

    • Author(s)
      Tomoya Nakatani
    • Organizer
      Magnetic Frontiers 2019: Magnetic Sensors
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Large magnetoresistive outputs in Heusler alloy-based CPP-GMR sensors using with AgInZnO spacers2018

    • Author(s)
      Tomoya Nakatani
    • Organizer
      Intermag 2018
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Ag-In-Zn-Oスペーサー層を用いたホイスラー合金CPP-GMR素子2018

    • Author(s)
      中谷友也
    • Organizer
      日本磁気学会学術講演会
    • Related Report
      2018 Research-status Report
  • [Book] 2020版 薄膜作製応用ハンドブック2020

    • Author(s)
      中谷友也(權田 俊一 監修)
    • Total Pages
      1570
    • Publisher
      (株)エヌ・ティー・エス
    • Related Report
      2019 Annual Research Report
  • [Patent(Industrial Property Rights)] 面直電流巨大磁気抵抗素子、その前駆体、及びその製造方法2018

    • Inventor(s)
      中谷友也、佐々木泰祐、古林孝夫、宝野和博
    • 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
    • Filing Date
      2018
    • Related Report
      2018 Research-status Report

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Published: 2018-04-23   Modified: 2021-02-19  

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