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Freezing Mechanism of Spins in Reentrant Spin-Glasses

Research Project

Project/Area Number 60540192
Research Category

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

Allocation TypeSingle-year Grants
Research Field 固体物性
Research InstitutionTOHOKU UNIVERSITY

Principal Investigator

MIYAZAKI Terunobu  Faculty of Engineering, Tohoku University, Associate Prof., 工学部, 助教授 (60101151)

Co-Investigator(Kenkyū-buntansha) HISATAKE Keizo  Department of Physics, Kanagawa Dental College, Prof., 物理教室, 教授 (50082813)
Project Period (FY) 1985 – 1986
Project Status Completed (Fiscal Year 1986)
Budget Amount *help
¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 1986: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1985: ¥1,000,000 (Direct Cost: ¥1,000,000)
KeywordsAc susceptibility / Field cooling effect / Mossbauer effect / Spin-glass transition / Magnetic phase diagram / Average hyperfine field / Antiferromagnetic interaction / Local magnetic field / Jの混合効果 / 交流帯磁率
Research Abstract

In order to shed light on the magnetism of reentrant spin-glasses, ac susceptibility, magnetization magnetic relaxation, field-cooling effect and Mossbauer spectroscopy on <^(57)Fe> have been investigated for the following alloy systems. (i) Polycrystalline <Fe_(100-x)> <Ni_x> (20<=x<=50) alloys, (ii) Single crystal <Fe_(65)> <Ni_(35)> alloy, (iii) Polycrystalline <(Fe_65Ni_35)_(1-x)(Fe_84Mn_16)_x> (0<=x<=0.26) alloys, (iv) Amorphous <(Fe_(1-x)M_x)_77> <Si_(10)> <B_(13)> (M=V,Cr,Mn,Co,Ni, 0<=x<=1) alloys, (v) Amorphous <Fe_(100-x)> <Sm_x> (17<=x<=72.5) and <Co_(100-x)> <Sm_x> (50<=x<=70) alloys.
The obtained results are summarized as follows.
(1) The magnetic phase diagram was determined for each alloy system described above. A spin-glass phase was observed in a certain composition range for each alloy system except <(Fe_(1-x)Co_x)_77Si_10B_13> amorphous alloy system.
(2) The transition temperature <T_g> between spin-glass and ferromagnet depends strongly on the measuring magnetic field. … More Therefore, the spin-glasses transform into ferromagnet by applying a magnetic field exhibiting a hysteresis loop.
(3) The average hyperfine field<H> obtained from analysis of the <^(57)Fe> Mossbauer spectrum exhibits a steeper increase below <T_g> for polycrystalline Fe-Ni-Mn and amorphous <(Fe_(1-x)Co_x)_77Si_10B_13> alloys, while does not for amorphous <Fe_(100-x)> <Sm_x> alloys. These results indicate that the freezing mechanism of spins in the Fe-Sm alloys is different from that in the Fe-Mn alloys.
(4) Based on the experimental results the most essential factor leading to spin freezing is the competition between the ferromagnetic and antiferromagnetic interactions in the alloys.
(5) The antiferromagnetic interaction in amorphous (Fe,Co)-Sm alloys is a exchange enhanced RKKY interaction caused by the crystal-induced J-mixing effects of <Sm^(3+)> .
(6) The antiferromagnetic interaction in other alloy systems may arise from iron atoms which are surrounded by a lower number of iron atom. The lower coordination number causes a frustration of iron spins. Less

Report

(1 results)
  • 1986 Final Research Report Summary
  • Research Products

    (16 results)

All Other

All Publications (16 results)

  • [Publications] T.Miyazaki,Y.Ando and M.Takahashi: Journal of Applied Physics. 57(1). 3456-3458 (1985)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] K.Hisatake;T.Miyazaki;M.Takahashi;K.Maeda;T.Hattori;I.Matsubara: physica status solidi(a). 93. 605-611 (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] T.Miyazaki;Y.Ando;M.Takahashi: Journal of Magnetism and Magnetic Materials. 60. 219-226 (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] T.Miyazaki;Y.Ando;M.Takahashi: Journal of Magnetism and Magnetic Materials. 60. 227-235 (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] T.Miyazaki;Y.Ando;M.Takahashi: Physical Review B. 34. 6334-6340 (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] YANG Xingbo;T.Izumi;T.Miyazaki;C.Horie;Migaku Takahashi: Journal of Magnetism and Magnetic Materials.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] T.Miyazaki;K.Yamada;Y.Ando;I.Okamoto;M.Takahashi: Digest of 25th International Magnetics Conference. (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] YANG Xingbo;K.Yamada;T.Miyazaki;M.Takahashi: Proceedings of Intenational Symposium on Physics of Magnetics Materials. (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] T. Miyazaki, Y. Ando and M. Takahashi: "Spin glass in Fe-Ni Invar alloys" Journal of Applied Physics. 57(1). 3456-3458 (1985)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] K. Hisatake, T. Miyazaki, M. Takahashi, K. Maeda, T. Hattori and I. Matsubara: "Anomalous behavior of Permeability around the Curie Temperature in Amorphous Fe-Ni-Si-B Alloys" physica status solidi (a). 93. 605-611 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] T. Miyazaki, Y. Ando and M. Takahashi: "Anomalous Temperature Dependence of Magnetization in Polycrystalline <Fe_(65)> <Ni_(35)> Alloy" Journal of Magnetism and Magnetic Materials. 60. 219-226 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] T. Miyazaki, Y. Ando and M. Takahashi: "Anomalous Temperature Dependence of Magnetization in Single-crystal <Fe_(65)> <Ni_(35)> Alloy" Journal of Magnetism and Magnetic Materials. 60. 227-235 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] T. Miyazaki, Y. Ando and M. Takahashi: "Low-field Magnetization and Mossbauer-effect Investigations in <(Fe_65Ni_35)_(1-x)(Fe_84Mn_16)_x> alloys" Physical Review B. 34. 6334-6340 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] YANG Xingbo, T. Izumi, T. Miyazaki, C. Horie and Migaku Takahashi: "Magnetic Properties of Amorphous Co-R (R=Sm,Nd,Pr) Alloys" Journal of Magnetism and Magnetic Materials.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] T. Miyazaki, K. Yamada, Y. Ando, I. Okamoto and M. Takahashi: "Magnetization and Mossbauer-effect Investigations in Amorphous <(Fe_(1-x)Mn_x)_(77)> <Si_(10)B_(13)> Alloys" Digest of 25th International Magnetics Conference. (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] YANG Xingbo, K. Yamada, T. Miyazaki and M. Takahashi: "Low Temperature Magnetic behaviour of Sm-(Fe,Co) Amorphous Alloys" Proceedings of International Symposium on Physics of Magnetics Materials. (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary

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Published: 1987-03-31   Modified: 2016-04-21  

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