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Measurement of hysteresis of superconducting tunnel current upon perpendicular magnetic field and application to new devices

Research Project

Project/Area Number 16K06319
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Electron device/Electronic equipment
Research InstitutionKanagawa University

Principal Investigator

Nakayama Akiyoshi  神奈川大学, 工学部, 教授 (90183524)

Co-Investigator(Kenkyū-buntansha) 阿部 晋  神奈川大学, 工学部, 非常勤講師 (10333147)
穴田 哲夫  神奈川大学, 付置研究所, 名誉教授 (20260987)
Project Period (FY) 2016-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2018: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2017: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2016: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Keywords超伝導 / ジョセフソン効果 / 磁界特性 / 垂直磁界依存性 / 履歴現象 / 超伝導デバイス / ジョセフソン接合 / Nb/AlOx/Nb / トンネル効果 / 接合電流の垂直磁界依存性 / トンネル素子 / 超伝導電流変調 / 磁束捕獲 / 捕獲磁束除去 / トンネル接合 / ジョセフソン素子 / 三端子素子 / 磁性体 / 垂直磁界
Outline of Final Research Achievements

We have fabricated niobium/aluminum-oxide/niobium tunnel type superconducting junctions. By applying perpendicular magnetic field to the junction plane, modulation characteristics of the junction current have been studied. The dependence of junction current upon perpendicular magnetic field has hysteresis. After applying the perpendicular magnetic field, the dependence of junction current on the parallel magnetic field differs from a normal Fraunhofer dependence. Superconducting current have also been recovered by applying the alternate perpendicular magnetic field.

Academic Significance and Societal Importance of the Research Achievements

超伝導集積回路では , シリコンデバイスに置き換わる可能性があり、高速なスイッチングで注目されている。
しかし超伝導集積回路への不要磁束の捕獲による超伝導電流の現象が問題となっている。本研究により , 垂直磁界を交番で加えることにより、一度減少した超伝導電流の復活がおこなえることがわかり、超伝導集積回路の問題点のひとつを解決する手だてが得られた。
また、履歴現象があるということは , 同じバイアス電流下で [0] と [1] の2状態が存在することになり , 新しい記憶素子, 論理素子への応用が期待できる。

Report

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

    (15 results)

All 2018 2017 2016

All Journal Article (1 results) (of which Peer Reviewed: 1 results) Presentation (14 results) (of which Int'l Joint Research: 11 results)

  • [Journal Article] Restoration of the Josephson Current by Applying a Vertical Magnetic Field2018

    • Author(s)
      鈴木敦之、中山明芳、阿部晋、渡邉騎通
    • Journal Title

      IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY

      Volume: 28 Issue: 4 Pages: 1200105-1200105

    • DOI

      10.1109/tasc.2018.2796596

    • Related Report
      2018 Annual Research Report 2017 Research-status Report
    • Peer Reviewed
  • [Presentation] 垂直磁界印加時におけるジョセフソン電流の二次元磁界変調特性2018

    • Author(s)
      渡邉騎通、江花昭哉ショーン、小林一樹、彦坂卓哉、鈴木 敦之、阿部晋、中山明芳
    • Organizer
      電子情報通信学会技術研究報告. SCE, 超伝導エレクトロニクス
    • Related Report
      2018 Annual Research Report
  • [Presentation] Influence of the thickness of the base Nb layer on flux trapping in the Nb superconducting film around the Josephson junction2018

    • Author(s)
      彦坂卓哉、中山明芳、江花昭哉ショーン、小林一樹、渡邉騎通、阿部晋
    • Organizer
      The 14th International Workshop of High-Temperature Superconductors in High Frequency Field
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Modulation characteristics of Josephson current through a Nb/Al-AlOx/Nb Josephson junction by applying the parallel magnetic field (Hx, Hy) and perpendicular magnetic field Hz2018

    • Author(s)
      渡邉騎通、中山明芳、江花昭哉ショーン、小林一樹、彦坂卓哉、阿部晋
    • Organizer
      The 14th International Workshop of High-Temperature Superconductors in High Frequency Field
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Two-dimensional magnetic field dependence of a Josephson current through a Josephson junction with different shapes” The 14th International Workshop of High-Temperature Superconductors in High Frequency Field2018

    • Author(s)
      江花昭哉ショーン、中山明芳、小林一樹、彦坂卓哉、渡邉騎通、阿部晋
    • Organizer
      The 14th International Workshop of High-Temperature Superconductors in High Frequency Field
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Influence of the Al thickness of Nb/Al-AlOx/Nb Josephson junction on two-dimensional magnetic field dependence of Josephson current2018

    • Author(s)
      小林一樹、中山明芳、江花昭哉ショーン、彦坂卓哉、渡邉騎通、阿部晋
    • Organizer
      The 14th International Workshop of High-Temperature Superconductors in High Frequency Field
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Modulation characteristics of a Josephson current through a superconducting tunnel junction by applying the parallel magnetic field (Hx, Hy) and perpendicular magnetic field Hz2018

    • Author(s)
      渡邉騎通、中山明芳、江花昭哉ショーン、小林一樹、彦坂卓哉、阿部晋
    • Organizer
      13th International Conference on Surfaces, Coatings and Nanostructured Materials
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Estimation of Pinhole Junction Position in Superconducting Quantum Interference Device Structure from Two-dimensional Magnetic Field Dependence of Josephson Current2018

    • Author(s)
      中山明芳、江花昭哉ショーン、渡邉騎通
    • Organizer
      13th International Conference on Surfaces, Coatings and Nanostructured Materials
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Influence of the thickness of the base Nb layer in a Josephson junction on flux trapping2018

    • Author(s)
      彦坂卓哉、中山明芳、江花昭哉ショーン、小林一樹、渡邉騎通、阿部晋
    • Organizer
      13th International Conference on Surfaces, Coatings and Nanostructured Materials
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Influence of the Al thickness of Nb/Al-AlOx/Nb Josephson junction on the current-voltage characteristics and two-dimensional magnetic field dependence of a Josephson junction2018

    • Author(s)
      小林一樹、中山明芳、江花昭哉ショーン、彦坂卓哉、渡邉騎通、阿部晋
    • Organizer
      13th International Conference on Surfaces, Coatings and Nanostructured Materials
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Modulation of a Josephson current through a Josephson junction with different shapes by two-dimensional scan of the external magnetic fields2018

    • Author(s)
      江花昭哉ショーン、中山明芳、小林一樹、彦坂卓哉、渡邉騎通、阿部晋
    • Organizer
      13th International Conference on Surfaces, Coatings and Nanostructured Materials
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 垂直磁界印加時におけるジョセフソン電流の二次元磁界変調特性2018

    • Author(s)
      渡邉騎通、江花昭哉ショーン、小林一樹、彦坂卓哉、鈴木敦之、阿部晋、中山明芳
    • Organizer
      電子情報通信学会 超伝導エレクトロニクス研究会
    • Related Report
      2017 Research-status Report
  • [Presentation] Restoration of the Josephson Current by Applying a Vertical Magnetic Field2017

    • Author(s)
      Atsushi Suzuki, Akiyoshi Nakayama, Susumu Abe, Norimichi Watanabe
    • Organizer
      The 13th biennial European Conference on Applied Superconductivity
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Modulation characteristics of a Josephson current through Nb tunnel junction by a parallel magnetic field and a perpendicular magnetic field2017

    • Author(s)
      Norimichi Watanabe, Susumu Abe, Akiyoshi Nakayama
    • Organizer
      The 13th biennial European Conference on Applied Superconductivity
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] 外部磁界によるジョセフソン電流の磁界変調特性2016

    • Author(s)
      鈴木、阿部、中山
    • Organizer
      電子情報通信学会ソサエティ大会
    • Place of Presentation
      北海道大学
    • Year and Date
      2016-09-15
    • Related Report
      2016 Research-status Report

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

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