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Magneto-volume Effects in Fe-based Amorphous Alloys

Research Project

Project/Area Number 04402045
Research Category

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

Allocation TypeSingle-year Grants
Research Field Physical properties of metals
Research InstitutionTOHOKU UNIVERSITY

Principal Investigator

FUKAMICHI Kazuaki  Faculty of Engineering, Tohoku University, Professor, 工学部, 教授 (00005969)

Co-Investigator(Kenkyū-buntansha) YOSHIHARA Akira  Research Institute for Scientific Measurements, Research associate, 科学計測研究所, 助手 (40166989)
AOKI Kiyoshi  Institute for Materials Research, Associte Professor, 金属材料研究所, 助教授 (70124542)
SHIMADA Yutaka  Research Institute for Scientific Measurements, Professor, 化学計測研究所, 教授 (00006157)
潟岡 教行  東北大学, 工学部, 助教授 (90194761)
Project Period (FY) 1992 – 1994
Project Status Completed (Fiscal Year 1994)
Budget Amount *help
¥21,000,000 (Direct Cost: ¥21,000,000)
Fiscal Year 1994: ¥1,600,000 (Direct Cost: ¥1,600,000)
Fiscal Year 1993: ¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 1992: ¥17,600,000 (Direct Cost: ¥17,600,000)
KeywordsPressure effect / Magnetovolume effect / Law of approach to saturation / Random axial magnetic anisotoropy / Hydrogen absorption / Valence / Spin glass / Structural analysis / 磁気弾性効果 / 圧縮率 / ブリュアン散乱 / 4極子分裂 / アイソマーシフト / 磁気相図 / 20面体クラスター / 希土類元素 / 熱膨張
Research Abstract

The pressure effects on the Curie temperature and magnetization for Fe-based amorphous alloys which have large magnetovolume effects have been investigated. The magnetization curves for the alloys with a very high concentration of Fe do not follow the law of approach to saturation with 1/H but follow that with 1/H^<1/2>. The latter power law is valid for the alloy systems which have antifferomagnetic interactions. It should be noted that the curves for random axial magnetic anisotropy alloy systems do not follow the 1/H^<1/2> law.
The temperature and field dependences of linear and forced volume magnetostrictions have been investigated. These two values are markedly large and the forced-volume magnetosriction exhibits a tendency to diverge at the spin freezing and the Curie temperatures. These results are very different from those for the localized systems.
The dramatic increase in the magnetization is caused by hydrogenation for Ce-Fe amorphous alloys. We can expect a huge coercivity at low temperatures due to the random magnetic anisotropy if the valence of Ce is reduce from tetravalent to trivalent by hydrogenation. However no such a large coercivity has been confirmed. This behavior is explained by the aggregation of hydrogen atoms around Ce atoms, resulting in the altered electronic structure. Therefore, we can not assume that the expansion of volume by hydrogenation as the negative pressure.
The changes in the magnetic properties by annealing for amorphous Y-Fe alloys are correlated to the increases in the interatomic distance of Fe-Fe pairs and the coordination numbers of Fe atoms.

Report

(4 results)
  • 1994 Annual Research Report   Final Research Report Summary
  • 1993 Annual Research Report
  • 1992 Annual Research Report
  • Research Products

    (31 results)

All Other

All Publications (31 results)

  • [Publications] T.Suzuki: "The Effect of Annealing on the Magnetic Phase Diagram for the Y-Fe Amorphous Alloys" J.Phys.Condens.Matter. 6. 5741-5750 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] M.Ghafari: "Mossbauer Study of Amorphous Fe_2RE Alloys" Hyperfine Interactions. 83. 261-266 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] A.Fujita: "Thermal Expansion and Inverse Magnetic Susceptibility Anomalies in Y-Fe Amorphous Alloys" Phys.Rev.B. 50. 6199-6202 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] T.Suzuki: "Thermal Expansion Anomaly in Amorphous Y-Fe Spin Glasses" Mater.Sci.Eng.A181/A182. 954-957 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] K.Fukamichi: "Magnetic Properties of Fe-based Icosahedral Cluster Amorphous Alloys" Mater.Sci.Eng.A181/A182. 860-863 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] T.H.Chiang: "Atomic Structures, The Mossbauer Effect in Amorphous La (Fe_xAl_<1-X>) _<13> Alloys Containing Icosahedral Clusters" J.Phys.Condens.Matter. 6. 3457-3468 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] T.Suzuki: "The Effect of Annealing of the Magnetic Phase Diagram for the Y-Fe Amorphous Alloys" J.Phys.Condens.Matter. 6. 5741-5750 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] M.Ghafari: "Mossbauer Study of Amorphous Fe_2RE Alloys" Hyperfine Interactions. 83. 261-266 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] A.Fujita: "Thermal Expansion and Inverse magnetic Susceptibility Anomalies in Y-Fe Amorphous Alloys" Phys.Rev.B. 50. 6199-6202 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] T.Suzuki: "Thermal Expansion Anomaly in Amorphous Y-Fe Spin Glasses" Mater.Sci.Eng.A181/A182. 954-957 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] K.Fukamichi: "Magnetic Properties of Fe-based Icosahedral Cluster Amorphous Alloys" Mater.sci.Eng.A181/A182. 860-863 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] T.H.Chiang: "Atomic Structures, the Mossbauer Effect in Amorphous La (Fe_xAl_<1-x>)_<13> Alloys Containing Icosahedral Clusters" J.Phys.Condens.Matter. 6. 3457-3468 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] T.Suzuki: "The effect of Annealing on the Magnetic Phase Diagram for the Y-Fe Amorphous Alloys" J.Phys.Condens.Matter. 6. 5741-5750 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] M.Ghafari: "Mossbauer Study of Amorphous Fe_2RE Alloys" Hyperfine Interactions. 83. 261-266 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] A.Fujita: "Thermal Expansion and Inverse Magnetic Susceptibility Anomalies in Y-Fe Amorphous Alloys" Phys.Rev.B. 50. 6199-6202 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] T.Suzuki: "Thermal Expansion Anomaly in Amorphous Y-Fe Spin Glasses" Mater.Sci.Eng.A181/A182. 954-957 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] K.Fukamichi: "Magnetic Properties of Fe-based Icosahedral Cluster Amorphous Alloys" Mater.Sci.Eng.A181/A182. 860-863 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] T.H.Chiang: "Atomic Structures,The Mossbauer Effect in Amorphous La(Fe_XAl_<1-X>)_<13> Alloys Containing Icosahedral Clusters" J.Phys.Condens.Matter. 6. 3457-3468 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] H.Komatsu: "Isomer Shift and Quadrupole Splitting of Amorphous Iron-Uniqueness of the State of Amorphous Pure Iron" Nucl.Instrum.Methods in Phys.Res.B76. 89-90 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] H.Komatsu: "Hyperfine Field and Reentrant Spin Glass Behavior in Amorphous Lu-Fe Alloys" Nucl.Instrum.Methods in Phys.Res.B76. 91-92 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] A.Fujita: "Differential Magnetic Susceptibility of Amorphous Fe-Y Alloys" J.Phys.Condens.Matter. 5. 3003-3010 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] A.Yoshihara: "Brillouin Scattering Determination of Magnetic and Elastic Constants in Invar-type La(Fe_XAl_<1-X>)_<13> Amorphous Alloy Films" J.Appl.Phys.75. 1733-1738 (1994)

    • Related Report
      1993 Annual Research Report
  • [Publications] 松原英一郎: "20面体Fe系アモルファス合金の構造と磁性" 日本金属学会会報. 32. 104-111 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] 佐藤勝昭: "光磁気ディスク材料" 工業調査会, 193 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] Y.Sakurai: "Current Topics in Amorphous Materials" North-Holland, 300 (1994)

    • Related Report
      1993 Annual Research Report
  • [Publications] E.Matsubara: "Structural Study of a New Amorphous la(Fe_<0.9>Al_<0.1>)_<13> Alloy Censisting of Icosahedral Clusters" Mater,Trans.JIM,. 33. 155-157 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] T.Goto: "Magnitic Phase Diagram of Amorphous Fe-rich Fe_<1-X>Lu_X Alloys" J.Magn.Magn.Mater.104〜107. 135-136 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] T.H.Chiang: "Thermal Expanision and Elastic Anomalies in La(Fe_XAl_<1-X>)_<13> Amorphous Alloys" J.Phys.Condens Matter. 4. 7489-7498 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] E.MAtsubara: "Effect of Low-Timperature Annealing on the Atomic Scale Structures in Amorphous Fe_2RE Alloys" J.Mater.Eng.Lett.11. 1521-1524 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] 深道 和明: "低熱膨張アモルファス合金" 化学工業. 43. 742-748 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] 松原 英一郎: "20面体Fe系とアモルファス合金の構造と磁性" 日本金属学会会報. 32. 104-111 (1993)

    • Related Report
      1992 Annual Research Report

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Published: 1992-04-01   Modified: 2016-04-21  

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