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2001 Fiscal Year Final Research Report Summary

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)
Project Period (FY) 1999 – 2001
KeywordsNanomagnets / Quantum transportation / Spintronics / Tunnel effect / Quantum nanowire / Conductance quantization / Aharonov-Bohm effect / Domain-wall dynamics
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.

  • Research Products

    (12 results)

All Other

All Publications (12 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
  • [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
  • [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
  • [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
  • [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
  • [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
  • [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
  • [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
  • [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
  • [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
  • [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
  • [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

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Published: 2003-09-17  

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