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Macroscopic Quantum Tunneling of Magnetic Domain Wall in Ferromagnetic Composite Thin Films

Research Project

Project/Area Number 09640448
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 固体物性Ⅱ(磁性・金属・低温)
Research InstitutionKEIO UNIVERSITY

Principal Investigator

MIYAJIMA Hideki  Keio University, Dept. of Physics, Professor, 理工学部, 教授 (70166180)

Co-Investigator(Kenkyū-buntansha) HYUGA Hiroyuki  Keio University, Dept. of Physics, Professor, 理工学部, 教授 (70126150)
ONO Teruo  Keio University, Dept. of Physics, Assistant, 理工学部, 助手 (90296749)
Project Period (FY) 1997 – 1998
Project Status Completed (Fiscal Year 1998)
Budget Amount *help
¥3,900,000 (Direct Cost: ¥3,900,000)
Fiscal Year 1998: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1997: ¥3,300,000 (Direct Cost: ¥3,300,000)
KeywordsComposite Film / Quantum Tunneling Effect / Magnetic Domain Wall / Pinning Center / Ferromagnetic Wire / Quantum Wire / Galvanomagnetic Effect / 量子トンネル効果 / 電気伝導の量子化 / 巨大磁気抵抗効果
Research Abstract

The purpose of this investigation is to clarify the quantum tunneling of magnetic domain wall into the pinning center in the composite thin film consisting of hard ferromagnet , soft ferromagnet and superconductors. This study is composed of three parts ; (1) the magnetization reversal process in ferromagnetic composite wire having a pinning center, (2) the magnetization reversal process in composite thin films, and (3) the galvanomagnetic effect in very thin ferromagnetic wire. The results are summarized as follows. (1) The magnetization reversal process and the wall displacement velocity in submicron Fe-Ni wire with tri-layer structure were investigated by measuring the electric resistance. The wall mobility was estimated to be about 2.6 m/sOe, due to Gilbert damping process. (2) The magnetostatic interaction dominates the magnetization process of hybrid films consisting of ferromagnetic Fe and superconducting Nb. The domain structure in the Fe film may depend on whether Nb is superconducting or not, and this affects the magnetization reversal. (3) The conductance of the nanowire produced by a tip and contact method was quantized in the unit of 2eィイD12ィエD1/h below 67 Oe and eィイD12ィエD1/h above 67 Oe. The spin degeneracy plays an important role in the conductance quantization. Unfortunately, the existence of the quantum macroscopic tunneling was hard to confirm at least present stage.

Report

(3 results)
  • 1998 Annual Research Report   Final Research Report Summary
  • 1997 Annual Research Report
  • Research Products

    (17 results)

All Other

All Publications (17 results)

  • [Publications] Y. Nozaki, T Ono ; H. Miyajima and K. Matsuyama: "Magnetic Domain Structure of Micron-size Co line arrays"Journal of the Magnetics Society of Japan. 23. 658-660 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] K. Motohashi, T. ono, T. Hinoue and H. Miyajima: "Magnetic properties of ferromagnetic, e-superconducting hybrid films"Journal of the Magnetics Society of Japan. 23. 697-699 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] T. Manago, T Ono, H.Miyajima ,K.Kawaguti and M. Sohma: "Appearance of ferromagnetism induced by proximity effect and exchange enhancement in multilayer consisting of antiferromagnetic NiO and paramagnetic Pd"Journal of the Physical Society of Japan. 68. 334-337 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] T. Manago, T Ono, H.Miyajima ,K.Kawaguti and M. sohma: "Magnetization process of NiO/Pd several layered and multilayered films"Solid State Communications. (発表予定). (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] T Ono, H.Miyajima, K. Shigeto and T. Shinjo: "Magnetization reversal in submicron magnetic wire studied by using giant magnetoresistance effect"Applied Physics Letters. 72. 1116-1117 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Y. Nazaki, T. Ono, H. miyajima at al.: "Magnetization reversal process in micron-size ferromagnetic Co line array"Journal of Magnetism and Magnetic Materials. 177-181. 1271-1272 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] T. Ono, H. Miyajima, K. Shigeto and T. Shinjo: "Magnetization reversal in submicron magnetic wire studied by using giant magnetoresistance effect"Applied Physics Letters. 72. 1116-1117 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Y. Nozaki, T. Ono, K. Motohashi, H. Miyajima, and T. Kinoshita: "Magnetization reversal process in micron-size feerromagnetic Co line array"Journal of Magnetism and Magnetic Materials. 177-181. 1271-1192 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] T. Manago, H. Miyajima, K. Kawaguchi, M. Sohma and I. Yamaguchi: "Structural and magnetic properties of NiO/Pd multilayers"Journal of Magnetism and Magnetic Materials. 177-181. 11191-1192 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Y. Nozaki, T. Ono, H. Miyajima, and K. Matsuyama: "Magnetic domain structure of micron-size Co line arrays"Journal of the Magnetics Society of Japan. 23. 658-660 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] K. Motohashi, T. Ono, T. Hinoue and H. Miyajima: "Magnetic properties of ferromagnetic-superconducting hybrid films"Journal of the Magnetics Society of Japan. 23. 697-699 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] T. Manago, T. Ono, H. Miyajima, K. Kawaguchi and M. Sohma: "Appearance of ferromagnetism induced by proximity effect and exchange enhancement in multilayer consisting of antiferromagnetic NiO and paramagnetic Pd"Journal of the Physical Society of Japan. 68. 334-337 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Y.Nozaki,T.Ono,H.Miyajima and K.Matsuyama: "Magnetic domain structure of micron-size Co line arrays" Journal of the Magnetics Society of Japan. 23. 658-660 (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] K.Motohashi,T.Ono,T.Hinoue and H.Miyajima: "Magnetic properties of ferromagnetic-Superconducting hybrid films" Journal of the Magnetics Society of Japan. 23. 697-699 (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] T.Manago,T.Ono,H.Miyajima K.Kawaguti and M.Sohma: "Appearance of ferromagnetism induced by proximity effect and exchange enhancement in multibyer consisting of autiferromagaetic NiO and paramagnetic Pd" Journal of the Physical Society of Japan. 68-2(発表予定). (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] T.Manago,T.Ono,H.Miyajima,K.Kawaguti and M.Sohma: "Magnetization Process of NiO/Pd Several layered and multilayered films" Solid State Communications. (発表予定). (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] T.Ono,H.Miyajima et al: "Magnetization reversal in submicron magnetic wire studied by using giant magnetoresistance effect" Applied Physics Letters. 72. 1116-1117 (1998)

    • Related Report
      1997 Annual Research Report

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Published: 1997-04-01   Modified: 2020-05-15  

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