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Correlation between superconductivity and ferromagnetism for nano-sized particle-dispersion-controlled thin films

Research Project

Project/Area Number 10650646
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Physical properties of metals
Research InstitutionTOHOKU UNIVERSITY

Principal Investigator

OBI Yoshihisa  Institute for Materials Research, Tohoku University, Assistant, 金属材料研究所, 助手 (80005925)

Co-Investigator(Kenkyū-buntansha) FUJIMORI Hiroyasu  Institute for Materials Research, Tohoku University, Professor, 金属材料研究所, 教授 (60005866)
IKEBE Manabu  Faculty of Engineering, Iwate University, Professor, 工学部・材料物性学科, 教授 (40005955)
Project Period (FY) 1998 – 1999
Project Status Completed (Fiscal Year 1999)
Budget Amount *help
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 1999: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1998: ¥3,000,000 (Direct Cost: ¥3,000,000)
Keywordssuperconductivity / ferromagnetism / thin film / critical temperature / upper critical field / proximity effect / 多層膜 / キュリー温度
Research Abstract

The purpose of this study is to investigate the influence of magnetic particles dispersed in superconducting matrix with nano-scale or ferromagnetic thin films touched by superconducting thin films to the superconductivity, that is, to investigate the correlation between superconductivity and ferromagnetism. To do so, we have added the consideration for the three systems made by sputter deposition as (1) superconductor/ferromagnet multilayer, (2) superconducting thin film dispersed by ferromagnetic particles in it, and (3) superconductor/non-magnetic material (including another type superconductor) multilayers. The main results are as follows: (i) We have found the 2-step oscillation phenomenon for Nb/Co and V/Co multilayers. This phenomenon is interpreted by the so-called π-phase theory. (ii) The dispersion system (Nb-matrix with Fe particles dispersed in matrix) shows the Tc degradation accompanied by the increase of Fe particle as obeying the law of the Abrikosov-Gorkov theory. (iii) The behavior of upper critical field and transition temperature observed in the superconductor/superconductor multilayers obeys the proximity-effect-theory.

Report

(3 results)
  • 1999 Annual Research Report   Final Research Report Summary
  • 1998 Annual Research Report
  • Research Products

    (14 results)

All Other

All Publications (14 results)

  • [Publications] 池部学: "On anomalous temperature dependence of Hc_2⊥ in natural and artificial layer superconductors"Physica C. 317-318. 142-148 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 小尾叙久: "Oscillation phenomenon of transition temperatures in Nb/Co and V/Co superconductor / ferromagnet multilayers"Physica C. 317-318. 149-153 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 小尾叙久: "Supercenducting transition temperature and dimensional crossover in Nb/Cn and V/Cn multilayers"Journal of Physical Society of Japan. 68巻8号. 2750-2754 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 小尾叙久: "Flux pinning characteristics in NbTi/Nb superconductor/superconductor multilayers"Physica B. (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] M. Ikebe, H. Fujishiro, Y. Obi, H. Fujimori and S. Morohashi: "On Anomalous Temperature Dependence of Hc2⊥ in Natural and Artificial Layer Superconductors"Physica C. Vol.317-318. 142-148 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Y. Obi, M. Ikebe, T. Kubo and H. Fujimori: "Oscillation Phenomenon of Transition Temperatures in Nb/Co and V/Co Superconductor. Ferromagnet Multilayers"Physica C. Vol.317-318. 149-153 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Y. Obi, M. Ikebe, H. Wakou and H. Fujimori: "Superconducting Transition Temperature and Dimensional Crossover in Nb/Co and V/Co Multilayers"Journal of Physical Society Japan. Vol.68, No.8. 2750-2754 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Y. Obi, M. Ikebe, H. Fujishiro and H. Fujimori: "Flux Pinning Characteristics in NbTi/Nb Superconductor/Superconductor Multilayers"Physica B. in press. (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 池部学: "On anomalous temperature dependence of Hc2 in natural artificial layer superconductors"Physica C. 317-318. 142-148 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 小尾俶久: "Oscillation phenomenon of transition temperatures in NblCo and V/Co superconductor/ferromagnet multilayers"Physica C. 317-318. 149-153 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 小尾俶久: "Superconducting Transition temperature and dimensional crossover in NblCo and V/Co multilayers"Journal of Physical Society of Japan. 68巻8号. 2750-2754 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 小尾俶久: "Flux pinning characteristics in NbTi/Nb superconductor/superconductor multilayers"Physica B. (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] 池部 学: "On anomalous temperature dependence of Hear in natural and artificial layer superconductors" Physica C. (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] 小尾俶久: "Oscillation phenomenon of transition temperatures in Nb/Co and V/Co superconductor/ferromagnet multiayers" Physica C. (1999)

    • Related Report
      1998 Annual Research Report

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Published: 1998-04-01   Modified: 2016-04-21  

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