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Study on Flux Trapping in Superconducting Integrated Circuits and Development of a Method for Eliminating Flux Trapping

Research Project

Project/Area Number 60550012
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field Applied materials
Research InstitutionKyushu University

Principal Investigator

YOSHIDA Keiji  Associate Professor, Faculty of Engineering, Kyushu University, 工学部, 助教授 (80108670)

Co-Investigator(Kenkyū-buntansha) ENPUKU Keiji  Associate Professor, Faculty of Engineering, Kyushu University, 工学部, 助教授 (20150493)
MATSUSHITA Teruo  Associate Professor, Faculty of Engineering, Kyushu University, 工学部, 助教授 (90038084)
IRIE Fujio  Professor, Faculty of Engineering, Kinki University, 工学部, 教授 (80037647)
Project Period (FY) 1985 – 1987
Project Status Completed (Fiscal Year 1987)
Budget Amount *help
¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1987: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1986: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1985: ¥1,400,000 (Direct Cost: ¥1,400,000)
KeywordsSuperconducting integrated circuits / 磁束トラップ
Research Abstract

The purpose of this research is to study the mechanism of flux trapping in superconducting integrated circuits and to develop an effective method for eliminating the trapped flux. We have conducted a series of study according to the initial plan, and successfully achieved the purpose. The obtained results are as follows:
1) Fabrication of Josephson junction arrays on Nb thin film and measurement of spatial distribution of trapped magnetic flux- We have developed a technique for fabricating good-quality Josephson junctions with Nb base electrode, and succeeded in realizing 50 series connected junctions.
2) Elucidation of flux-trapping mechanism- We have considered a probable mechanism for the flux trapping based on the experimental results. It has been shown that there are two mechanisms of flux pinning,i.e., bulk pinning and surface pinning.
3) Experiment on eliminating flux trapping- We have made an experiment on eliminating the trapped flux by irradiating a light beam from He-Ne laser. It is shown that the trapped flux can be eliminated by the laser irradiation of the power of 10-100<micrn>W.
4) We have considered usefull methods for eliminating the flux trapping based on the above scheme.

Report

(2 results)
  • 1987 Final Research Report Summary
  • 1986 Annual Research Report

Research Products

(19 results)

All Other

All Publications (19 results)

  • [Publications] K.Yoshida et al.: IEEE Transactions on Maguetics. MAG-23. 723-726 (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] K.Yoshida et al.: IEEE Transactions on Magnetics. MAG-23. 1106-1109 (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] K.Yoshida et al.: IEEE Transactions on Magnetics. MAG-23. 1283-1286 (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] T.Kisu et al.: Japanese Journal of Applied Physics. 26. L1348-L1351 (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] K.Enpuku et al.: Japanese Journal of Applied Physics. 26. 1647-1648 (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] T.Matsushita et al.: Japanese Journal of Applied Physics. 26. L1524-L1527 (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] K.Enpuku et al.: Superconductivity Electronics. 313 (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] K.Yoshida et al.: "Superconductivity Electronics" Ohmsha, 313 (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] K,Yoshida et al.: "Analog Amplifier with Large Current Gain" IEEE Transations on Magnetics. MAG-23. 723-726 (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] K.Yoshida et al.: "Integrated Gradiometer with Large <beta> SQUID" IEEE Transactions on Magnetics. MAG-23. 1106-1109 (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] K. Yoshida et al.: "Millimeter Wave Emissicon from Josephson Oscillator through Thin Junction Electrode" IEEE Transactions on Magnetics. MAG-23. 1283-1286 (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] T.Kisu et al.: "Spatial Distribution of Trapped Magnetic Flux in the High Tc Superconductor Y_1 Ba_2 Cu_3 O_<7-8>" Japanese Journal of Applied Physics. 26. L1348-L1351 (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] K. Enpuku et al.: "Performance of Large-<beta> SQUID with a Damping Resistor" Japanese Journal of Applied Physics. 26. 1647-1648 (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] K.Yoshida et al.: Superconductivity Electronics. Ohmsha, 313 (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] F.Irie: Proc.Int.Conf.on SQUID. 3. 431-460 (1986)

    • Related Report
      1986 Annual Research Report
  • [Publications] K.Enpuku: Proc.Int.Conf.on SQUID. 3. 767-772 (1986)

    • Related Report
      1986 Annual Research Report
  • [Publications] K.Enpuku: J.Appl.Phys.59. 1714-1719 (1986)

    • Related Report
      1986 Annual Research Report
  • [Publications] K.Enpuku: J.Appl.Phys.60. 4218-4223 (1986)

    • Related Report
      1986 Annual Research Report
  • [Publications] 吉田啓二: "超高速ジョセフソン・デバイス" 培風館, 321 (1986)

    • Related Report
      1986 Annual Research Report

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Published: 1987-03-30   Modified: 2016-04-21  

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