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Spin-triplet Josepshon junction using half-metallic Co-based Heusler alloy

Research Project

Project/Area Number 20K22487
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeMulti-year Fund
Review Section 0402:Nano/micro science, applied condensed matter physics, applied physics and engineering, and related fields
Research InstitutionNational Institute for Materials Science

Principal Investigator

FUJITA Yuichi  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, ICYS研究員 (40874459)

Project Period (FY) 2020-09-11 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2021: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywordsホイスラー合金 / ハーフメタル / 巨大磁気抵抗効果 / 超伝導薄膜 / 超伝導
Outline of Research at the Start

近年,自然科学,医療,産業,安全保障など幾多の分野において大規模計算の需要が高まっており,その技術開発が強く望まれている.本研究では,次世代大規模計算機のハードウェア技術として期待される超伝導デジタル回路素子や超伝導量子ビットの動作の核となる超伝導体の巨視的波動関数の位相シフトの安定的な誘起を実現するため,ハーフメタル型Co系ホイスラー合金層を中間層に含むジョセフソン接合素子を実現し,ロバストなスピン三重項超伝導を介した位相シフトの実証を目指す.

Outline of Final Research Achievements

Ferromagnetic Josephson junction (FJJ) has attracted great attention because it can improve performance of superconducting classical/quantum circuits. In this project, to realize FJJs with robust and uniform device properties, I have focused on the long-range spin-triplet supercurrent. I found that the half-metallic Co-based Heusler alloys may be promising ferromagnetic materials for highly efficient generation and propagation of spin-triplet supercurrent in FJJs. Further, I developed a controlled fabrication process to form superconducting platform for realization of high-quality FJJs.

Academic Significance and Societal Importance of the Research Achievements

本研究では,安定かつ均一に機能する新規強磁性ジョセフソン接合(JJ)に適した強磁性材料としてCo系ホイスラー合金が有望である可能性を見出し,また強磁性JJの高品位形成のための超伝導プラットフォームの形成プロセスを開発した.これらは,強磁性JJ以外の超伝導回路素子やスピントロニクス素子などの次世代エレクトロニクス技術の研究開発や,強磁性体・超伝導体薄膜の物性研究にも重要な知見をもたらす,学術的かつ社会的に意義が深い研究成果である.

Report

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

    (7 results)

All 2022 2021

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

  • [Journal Article] Fabrication of Co2FeSi Heusler-alloy epitaxial film on NbN epilayer with improved surface morphology2022

    • Author(s)
      Yuichi Fujita, Taisuke Sasaki, Yuya Sakuraba
    • Journal Title

      Thin Solid Films

      Volume: 745 Pages: 139084-139084

    • DOI

      10.1016/j.tsf.2022.139084

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Spin-scattering asymmetry at half-metallic-ferromagnet|ferromagnet interface2021

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

      Physical Review B

      Volume: 104 Issue: 14

    • DOI

      10.1103/physrevb.104.l140403

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Presentation] Developing Structures and Materials of Current-Perpendicular-to-Plane Giant Magnetoresistance Devices for Spintronic and Superconducting Electronic Applications2022

    • Author(s)
      Yuichi Fujita
    • Organizer
      The 5th International Union of Materials Research Societies International Conference of Young Researchers on Advanced Materials (IUMRS-ICYRAM 2022)
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Large spin-scattering asymmetry at half-metallic Co-based Heusler-alloy/ferromagnet interface2022

    • Author(s)
      Y. Fujita, Y. Miura, T. Sasaki, T. Nakatani, K. Hono, Y. Sakuraba
    • Organizer
      2022 Joint MMM-INTERMAG
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] Large impact of spin-scattering asymmetry at Co2Fe0.4Mn0.6Si/CoFe ferromagnetic interface on current-perpendicular-to-plane giant magnetoresistance2021

    • Author(s)
      Yuichi Fujita, Yoshio Miura, Taisuke Sasaki, Tomoya Nakatani, Kazuhiro Hono, Yuya Sakuraba
    • Organizer
      第82回応用物理学会秋季学術講演会
    • Related Report
      2021 Research-status Report
  • [Presentation] Large impact of spin asymmetry at half-metallic Co2Fe0.4Mn0.6Si/CoFe interface on current-perpendicular-to-plane giant magnetoresistance2021

    • Author(s)
      Y. Fujita, Y. Miura, T. Sasaki, T. Nakatani, K. Hono, Y. Sakuraba
    • Organizer
      The 32nd Magnetic Recording Conference (TMRC 2021)
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Patent(Industrial Property Rights)] 面直通電型巨大磁気抵抗素子及びその製造方法2021

    • Inventor(s)
      藤田 裕一/桜庭 裕弥/三浦 良雄/佐々木 泰祐/宝野 和博
    • Industrial Property Rights Holder
      物質・材料研究機構
    • Industrial Property Rights Type
      特許
    • Filing Date
      2021
    • Related Report
      2020 Research-status Report

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Published: 2020-09-29   Modified: 2024-01-30  

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