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Mechanism of Quantum Transportation and Macroscopic Quantum Tunnel Effect in Nanomagnets

Research Project

Project/Area Number 11440116
Research Category

Grant-in-Aid for Scientific Research (B)

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, Department of Physics, Professor, 理工学部, 教授 (70166180)

Co-Investigator(Kenkyū-buntansha) SAITOH Eiji  Keio University, Department of Physics, Instructor, 理工学部, 助手 (80338251)
SHIRAHAMA Keiya  Keio University, Department of Physics, Assistant Professor, 理工学部, 助教授 (70251486)
小野 輝男  大阪大学, 大学院・基礎工学研究科, 講師 (90296749)
Project Period (FY) 1999 – 2001
Project Status Completed (Fiscal Year 2001)
Budget Amount *help
¥15,200,000 (Direct Cost: ¥15,200,000)
Fiscal Year 2001: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2000: ¥5,400,000 (Direct Cost: ¥5,400,000)
Fiscal Year 1999: ¥9,100,000 (Direct Cost: ¥9,100,000)
KeywordsNanomagnets / Quantum transportation / Spintronics / Tunnel effect / Quantum nanowire / Conductance quantization / Aharonov-Bohm effect / Domain-wall dynamics / 量子ナノワイヤー / AB効果 / ナノリング / 弱局在 / 磁性細線 / ナノワイヤー
Research Abstract

Diffusive as well as ballistic electronic transportation in nanomagnets has been investigated. The results are summed up as follows: (1) A conspicuous oscillation of magnetoresistance due to the Aharonov Bohm effect was found in a ferromagnetic NiFe nano-ring fabricated using the electron lithography. (2) The external magnetic and electric field dependence of the conductance quantization was found in Ni quantum wires. All the results indicate that the coherence of a conduction electron dominates the transport property in nanoscale ferromagnets in spite of the possible strong scattering of the conduction electron due to the local spins. Furthermore, the observed external-field dependence of the quantized conductance implies an important role of the magnetic structure in the ballistic transportation of electron in ferromagnets. On the other hand, correlations between the magnetic structures and the diffusive transportation, which has been theoretically predicted in ferromagnets, have not been observed so far in the present study. Some experiments for the investigation of the correlation using nanomagnets in which the magnetic structures can be controlled in terms of the magnetic shape anisotropy and the extra magnetic field are now under contemplation.

Report

(4 results)
  • 2001 Annual Research Report   Final Research Report Summary
  • 2000 Annual Research Report
  • 1999 Annual Research Report
  • Research Products

    (25 results)

All Other

All Publications (25 results)

  • [Publications] T.Hinoue, H.Miyajima., et al.: "Magnetization process of ferromagnetic-supercondnotor hybrid films"Journal of Magnetism and Magnetic Materials. 226-230. 1583-1584 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T.Ono, H.Miyajima., et al.: "Magnetic and transport properties of magnetic wires down to 20nm in width"Journal of Magnetism and Magnetic Materials. 226-230. 1831-1832 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Y.Ooka, H.Miyajima., et al.: "Conductance quantization in ferromagnetic Ni nanowire"Journal of Magnetism and magnetic Materials. 226-230. 1848-1849 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] H.Katsuno, H.Miyajima., et al.: "Galvandmagnetic effect and domain wall resistance of ferromagnetic Fe-Ni wire in submicrometer width"Journal of Magnetism and magnetic Materials. 226-230. 1864-1866 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T.Ono, H.Miyajima., et al.: "Magnetization reversal and electric tramsport in terromagnetic nanowires"Materials Science and Engineering. B84. 126-132 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] E.Saitoh, H.Miyajima., et al.: "Aharonov-Bohm Osillation of Resistance observed in a Ferromagnetic Fe-Ni Nanoring"Applied Physics Letters. (inn press). (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T. Hinoue and H. Miyajima et al.: "Magnetization process of ferromagnetic-superconductor hybrid films"Journal of Magnetism and Magnetic Materials. 226-230. 1583-1584 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T. Ono, H. Miyajima et al.: "Magnetic and transport properties of magnetism wires down to 20nm in width"Journal of Magnetism and Magnetic Materials. 226-230. 1831-1832 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Y. Ooka, H. Miyajima et al.: "Conductance quantization in ferromagnetic Ni nanowire"Journal of Magnetism and Magnetic Materials. 226-230. 1848-1849 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] H. Katsuno, H. Miyajima et al.: "Galvanomagnetic effect and domain wall resistance of ferromagnetic Fe-Ni wire in submicrometer width"Journal of Magnetism and Magnetic Materials. 226-230. 1864-1866 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T. Ono, H. Miyajima et al.: "Magnetization reversal and electric transport in ferromagnetic nanowires"Materials Science and Engineering. B84. 126-132 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] E. Saitoh, H. Miyajima et al.: "Aharonov-Bohm Osillation of Resistance observed in a"Applied Physics Letters. (in press). (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T.Hinoue, H.Miyajima et al.: "Magnetization process of ferromagnetic-superconduetor hybrid films"Journal of Magnetism and Magnetic Materials. 226-230. 1583-1584 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] T.Ono, H.Miyajima et al.: "Magnetic and transport properties of magnetic wires down to 20mm in width"Journal of Magnetism and Magnetic Materials. 226-230. 1831-1832 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Y.Ooka, H.Miyajima et al.: "Conductance quantization in ferromagnetic Ni nanowire"Journal of Magnetism and Magnetic Materials. 226-230. 1848-1849 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] H.Katsuno, H.Miyajima et al.: "Galvanomagnetic effect and domain wall resistance of ferromagnetic Fe-Ni wire in submicrometer width"Journal of Magnetism and Magnetic Materials. 226-230. 1864-1866 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] T.Ono, H.Miyajima et al.: "Magnetization reversal and electric transport in ferromagnetic nanowires"Materials Science and Engineering. B84. 126-132 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 宮島英紀: "磁気特性への挑戦"ふえらむ(日本鉄鋼協会誌). 6. 948-953 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 宮島英紀: "メゾスコピック系の磁性"ふえらむ(日本鉄鋼協会会誌). 5巻:6号. 409 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] 勝野弘,新山卓,小野輝男,宮島英紀: "局所磁場下におけるパーマロイ細線の電流磁気効果"日本応用磁気学会誌. 24巻,9号. 1254 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] 檜上竜也,清水正義,小野輝男,宮島英紀: "強磁性体-超伝導体複合構造膜の磁化過程"日本応用磁気学会誌. 24巻,9号. 1258 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] 小野輝男,大岡豊,宮島英紀: "強磁性ポイントコンタクトの量子化コンダクタンスと巨大磁気抵抗"まてりあ(日本金属学会会誌). 39巻・6号. 531 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] T.Ono,Y.Ooka,H.Miyajima and Y.Otani: "2e^2/h to e^2/h switching of quantum conductance associaite d with a change in nanoscale terromagntic domain structure"Applied Physics Letters. 75. 1622-1624 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Y.Nozaki,K.Matsuyama,T.Ono and H.M.Yajima: "Micromagnetic Structure Analysis of Hend-on-Hend-Type180゜ Domain Wall in submicron Size Co Wires"Jpn J.Appl.Phys.. 38. 6282-6286 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] K.Shirahama,H.Suto.Oleg I.Kirichek,K. Kono: "Wigner solid on the free surface of superfluid ^3He"Physica B. 284-288(in press). (2000)

    • Related Report
      1999 Annual Research Report

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Published: 1999-04-01   Modified: 2020-05-15  

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