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Behaviors of Magnetizations in Nanostructured Systems

Research Project

Project/Area Number 12640348
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 InstitutionKYOTO UNIVERSITY

Principal Investigator

SHINJO Teruya  Kyoto University, Professor, 化学研究所, 教授 (70027043)

Co-Investigator(Kenkyū-buntansha) SHIGETO Kunji  Japan Society for the Promotion of Science, Research Fellow, 化学研究所, 学振特別研究員
MIBU Ko  Kyoto University, Assistant Professor, 化学研究所, 助教授 (40222327)
Project Period (FY) 2000 – 2001
Project Status Completed (Fiscal Year 2001)
Budget Amount *help
¥3,700,000 (Direct Cost: ¥3,700,000)
Fiscal Year 2001: ¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 2000: ¥1,900,000 (Direct Cost: ¥1,900,000)
Keywordsnanofabrication / Permalloy dot / vortex / magnetization reversal / AMR (Anisotropic magneto resistance) / MFM (Magnetic force Microscopy) / ボルデックス / メスバウアー効果 / 常磁性
Research Abstract

Using electron-beam lithography with lift-off method, nanoscale dots and wires of ferromagnetic materials (Permalloy) has been prepared. By MFM (Magnetic Force Microscopy) observation, the existence of turned-off magnetization spot at the center of circular permalloy dot has been confirmed. The vortex spin structure with a turned-off core is realized in the dots of 0.2〜5 μm diameter. It an external field is applied along the film normal, the spot magnetization has been reversed at about 0.4T. For in-plane field, the vortex structure is annihilated at about 0.1T. The mechanisms for the reversal are therefore different. For square or ellipsoidal dots, the closure magnetic domain structures are observed and the mode of circulation is identified. However, it is experimentally confirmed that the direction of turned-off magnetization and the mode of vortex circulation have no correlation. Namely the chirality rule does not exist. MFM images were also obtained for cross-tie walls in nanoscal rectangular permalloy plates and the existence of perpendicular magnetization spots are confirmed at each cross point of domains. By electric resistively measurements for a single dot with 5 μm diameter, the rotation of magnetization by external field is studied.
Recently there have been two reports for extremely large MR effect happened at point-contact systems. We have prepared permalloy wire systems including nanoscale contact. Although the domain wall is confined at the contact place, the resistively change is not large but can be accounted for as the AMR effect.

Report

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

    (22 results)

All Other

All Publications (22 results)

  • [Publications] T.Shinjo: "Magnetization Reversal Phenomena and Domain Wall Behaviors in Nanostructured Magnetic Systems"Acta. Physica Polonica. (印刷中). (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T.Okuno, T.Shinjo 他3名: "MFM study of magnetic vortex cores in circular permalloy dots : Behavior in external field"J. Magnetism and Magnetic Materials. (印刷中). (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T.Shinjo, K.Mibu: "Mossbauer Studies on Magnetic Multilayers"Hyperfine Interactions. (印刷中). (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T.Shinjo 他4名: "Magnetic Structures of Nanoscale Wire and Dot Systems"Physics Status Solidi. (印刷中). (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] 奥野拓也, 新庄輝也 他5名: "磁気力顕微鏡によるボルテックススピン構造の観察"固体物理. 37・2. 43-49 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] 新庄 輝也: "人工格子入門"内田老鶴圃. 170 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T.Shinjo 編著: "Spin Dependent Transport in Magnetic Nanostructures"Taylor and Fransis. 200 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T. Shinjo: "Magnetization Reversal Phenomena and Domain Wall Behaviors in Nanostructured Magnetic Systems"Acta. Physica Polonica. (To be published). (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T. Okuno, T. Shinjo eds.: "MFM study of magnetic vortex cores in circular permalloy Dots: Behavior in external field"J. Magnetism and Magnetic Materials. (To be published). (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T. Shinjo, K. Mibu: "Mossbauer Studies on Magnetic Multilayers"Hyperfine Interactions. (To be published). (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T. Shinjo eds.: "Magnetic Structures of Nanoscale Wire and Dot Systems"Physics status Solidi. (To be published). (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T. Shinjo and S. Maekawa eds.: "Spin Transport in Nanostructured Magnetic Systems"Taylor and fransis. (To be published). (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T.Shinjo: "Magnetization Reversal Phenomena and Domain Wall Behaviors in Nanostructured Magnetic Systems"Acta. Physica Polonica. (印刷中). (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] T.Okuno, T.Shinjo 他3名: "MFM study of magnetic vortex cores in circular permalloy dots : Behavior in external field"J.Magnetism and Magnetic Materials. (印刷中). (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] T.Shinjo, K.Mibu: "Mossbauer Studies on Magnetic Multilayers"Hyperfine Interactions. (印刷中). (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] T.Shinjo 他4名: "Magnetic Structures of Nanoscale Wire and Dot Systems"Physics Status Solidi. (印刷中). (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] 奥野拓也, 新庄輝也 他5名: "磁気力顕微鏡によるボルテックススピン構造の観察"固体物理. 37.2. 43-49 (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] 新庄 輝也: "人口格子入門"内田老鶴圃. 170 (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] T.Shinjo 編著: "Spin Dependent Transport in Magnetic Nanostructures"Taylor and Fransis. 200 (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] T.Shinjo: "Magnetic Vortex Core Observation in Circular Dots of Permalloy"Science. 289. 930-932 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] K.Shigeto: "Magnetization switching of a magnetic wire with trilayer structure using GMR"J.Appl.Phys.. 88. 6636-6642 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] M.Almokhtar: "Magnetism of Cr in V/Cr multilayers by ^<119>Sn Mossbauer spectroscopy"J.Phys.: Condens.Matter. 12. 9247-9257 (2000)

    • Related Report
      2000 Annual Research Report

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Published: 2000-04-01   Modified: 2020-05-15  

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