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Theoretical investigations of Anomalous Magnetism in Amorphous Transition Metals and Alloys.

Research Project

Project/Area Number 02640283
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 物性一般(含極低温・固体物性に対する理論)
Research InstitutionHokkaido Institute of Technology

Principal Investigator

KAKEHASHI Y.  Hokkaido Inst. Tech., Physics Dept. Assist. Prof., 教養部, 助教授 (10191975)

Project Period (FY) 1990 – 1991
Project Status Completed (Fiscal Year 1991)
Budget Amount *help
¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1991: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1990: ¥600,000 (Direct Cost: ¥600,000)
KeywordsAmorphous metals / Transition metals / Spin glass / Itinerant magnetism / Structural disorder / Curie temperature / 遷移金属 / 遍歴電子磁性
Research Abstract

Recently, anomalous magnetic behaviors such as the spin glass (SG) state and high Curie temperatures (>1800 K) have been found in Fe-rich and Co-rich amorphous transition metal alloys. In order to clarify the anomalous behaviors, we have investigated the magnetism of amorphous transition metals on the basis of the finite temperature theory of local environment effect in amorphous metallic magnetism. Our conclusions are summarized as follows.
1. The simple ferromagnetism in Fe, Co, and Ni is drastically changed by the structural disorder ; (1) Amorphous Fe shows the itinerant electron SG because of the nonlinear magnetic couplings between Fe local moments and the local environment effects on the amplitudes of local moments. (2) The Curie temperature in amorphous Co is enhanced by about 400 K because of the magnetic energy gain due to the shift of the non-interacting density of states. (3) The strong ferromagnetism in amorphous Ni is weakened because of the same reason.
2. We examined the SG around amorphous Fe, so that we found the following new results. (1) There exists the cluster SG region with the ferromagnetic clusters between the SG and the ferromagnetism when the d electron number is varied. (2) Re-entrant SG was found near the ferromagnetic boundary. Theoretical results semi-quantitatively explained the magnetic-field and pressure effects on the re-entrant SG in Fe-rich Fe-Zr and Fe-La amorphous alloys. (3) The strong anomaly of the forced volume magnetostriction at the re-entrant SG temperature is characteristic of the itinerant SG which is never seen in the insulator systems.

Report

(3 results)
  • 1991 Annual Research Report   Final Research Report Summary
  • 1990 Annual Research Report
  • Research Products

    (23 results)

All Other

All Publications (23 results)

  • [Publications] Y.Kakehashi: "Finite-temperature theory of local environment effects in amorphous and liguid magnetic alloys." Phys.Rev.B. 41. 9207-9220 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Y.Kakehashi: "Amomalous magnetic phase transition in amorphous transition metals and alloys." J.Magn.Magn.Mater.90&91. 333-334 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Y.Kakehashi: "Systematic Variations of Megnetic Properties in 3d Transition Metal Alloys." Prog.Theor.Phys.Supplement.101. 105-117 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 梯 祥郎: "アモルファス遷移金属磁性の新しい描像" 日本金属学会会報. 30. 131-139 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 梯 祥郎: "アモルファス鉄のスピングラス" 固体物理. 26. 348-357 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Y.Kakehashi: "Magnetism in amorphous transition metals." Phys.Rev.B.43. 10820-10831 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Y. Kakehashi: "Finite-temperature theorry of local environment effects in amorphous and liquid magnetic alloys." Phys. Rev. B. 41. 9207-9220 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Y. Kakehashi: "Anomalous magnetic phase transition in amorphous transition metals and alloys." J. Magn. Mater.90 & 91. 333-334 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Y. Kakehashi: "Systematic Variations of Magnetic Properties in 3d Transition Metal Alloys." Prog. Theor. Phys. Supplement. 101. 105-117 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Y. Kakehashi: "A New Picture of Magnetism in Amorphous Transition Metals." Nippon Kinzoku Gakkai Kaiho. 30. 131-139 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Y. Kakehashi: "Spin Glass in Amorphous Fe." Kotai Butsuri. 26. 348-357 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Y. Kakehashi: "Magnetism in amorphous transition metals." Phys. Rev. B. 43. 10820-10831 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Y. Kakehashi: "On the anomalous forced volume magnetostriction of the re-entrant spin glasses in Fe-rich amorphous alloys." J. Magn. Magn. Mater.103. 78-80 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Y. Kakehashi: "Magnetism in amorphous transition metals II." Phys. Rev. B.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Y. Kakehashi: "New magnetism in amorphous transition metals and alloys." J. Magn. Magn. Mater.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Y. Kakehashi: "Geometrical-mean model in amorphous magnetic alloys." J. Magn. Magn. Mater.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 梯 祥郎: "FiniteーTemperature Theory of Local EnVironment Effects in Amorphous and Liquid Magnetic Alloys." Phys.Rev.B. 41. 9207-9220 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] 梯 祥郎: "Anomalous Magnetic Phase transition in Amorphous Transition Metals and Alloys." J.Magn.& Magn.Mater.90&91. 333-334 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] 梯 祥郎: "Systematic Variations of Magnetic Properties in 3d Transition Metal Alloys." Prog.Theor.Phys.(Supplement). 101. 1-12 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] 梯 祥郎: "アモルファス遷移金属磁性の新しい描像" 日本金属学会会報. 30. 131-139 (1991)

    • Related Report
      1990 Annual Research Report
  • [Publications] 梯 祥郎: "FiniteーTemperature Theory of Magnetism in Amorphous Metals and Alloys." Proc.Int.Confーon Computer Applications to Materials Science and Engineering,ed.M.Doyama et al.(Elsevier,Amsterdam,1991). (1991)

    • Related Report
      1990 Annual Research Report
  • [Publications] 梯 祥郎: "Amorphous Magnetism in Transition Metals.I." Phys.Rev.B.(1991)

    • Related Report
      1990 Annual Research Report
  • [Publications] 梯 祥郎: "物理学" 杉山書店, 375 (1991)

    • Related Report
      1990 Annual Research Report

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Published: 1990-04-01   Modified: 2016-04-21  

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