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Systematic Research on High-Field Magnetization Process in Nd_2Fe_<14>B-type Mixed Compounds

Research Project

Project/Area Number 01540262
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

KATO Hiroaki  Tohoku Univ. I. M. R., Research Associate, 金属材料研究所, 助手 (40177465)

Co-Investigator(Kenkyū-buntansha) NAKAGAWA Yasuaki  Tohoku Univ. I. M. R., Professor, 金属材料研究所, 教授 (10005944)
YAMADA Motohiko  Tohoku Univ. I. M. R., Associate Professor, 金属材料研究所, 助教授 (40005848)
KIDO Giyuu  Tohoku Univ. I. M. R., Associate Professor, 金属材料冶究所, 助教授 (10013541)
Project Period (FY) 1989 – 1990
Project Status Completed (Fiscal Year 1990)
Budget Amount *help
¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 1990: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1989: ¥1,500,000 (Direct Cost: ¥1,500,000)
KeywordsNd_2Fe_<14>B / Permanent Magnet / Nd-Fe-B Magnet / High Magnetic Field / Magnetization Curve / Crystalline Electric Field / Magnetic Anisotropy / 希土類鉄磁石 / Nd_2Fe_<14>B / Nd-Fe-B型化合物 / FOMP
Research Abstract

(1) High-field magnetization process in R_2Fe_<14>B single crystals (R : rare earth element) has been investigated experimentally and theoretically. A wide variety of magnetizations including the first-order magnetization process (FOMP) and the spin reorientation phenomena is reproduced by the following calculation : the ferromagnetism of the Fe sublattice is treated phenomenologically, and the crystalline electric field (CEF) theory is strictly applied to the R ions which are subject to the molecular field due to the Fe sublattice.
(2) The magnetic behavior of single crystal Nd_2(Fe_<1-x>Al_x)_<14>B has been studied in steady high magnetic fields up to 300 kOe. The field H_j where the FOMP occurs increases rapidly with x. The experimental data are interpreted in terms of molecular field H_m which decreases with increasing x and the CEF parameters.
(3) High-field magnetization measurements on single crystals of (Nd-Y)_2Fe_<14>B and (Nd-La)_2Fe_<14>B have been performed in steady high magnetic fields. The observed data including FOMP are successfully described by a simple dilution model based on CEF and molecular field parameters obtained for Nd_2Fe_<14>B.
(4) In the quasi-binary system (Nd_<1-x>Dy_x)_2Fe_<14>B, the field H_j increases rapidly with x, reaching 320 kOe for the sample with x=0.33. The spin reorientation temperature, on the other hand, decreases with increasing x. These data are well explained by a simple a simple mixture model, in which the total free energy is the simple superposition of those of the two end members, neglecting the Nd-Dy interaction.
(5) The high reproducibility of the present calculations enables us that the magnetic properties of the quasi-binary system (R_<1-x>R'_x)_2Fe_<14>B can be predicted for any combination of rare earth elements R and R'.

Report

(3 results)
  • 1990 Annual Research Report   Final Research Report Summary
  • 1989 Annual Research Report
  • Research Products

    (18 results)

All Other

All Publications (18 results)

  • [Publications] Y. Nakagawa: "Highーfield Measurements and Crystalーfield Calculations on Magnetic Properties of Nd_2Fe_<14>Bーtype Alloys" Proc.Int.Symposium on Magnetic Anisotropy and Coercivity in Rare EarthーTransition Metal Alloys, Pittsburgh. 12-35 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] M.C.D. Deruelle: "Magnetic Properties of Nd_2(Fe_<1ーx>M_x)_<14>B Single Crystals (M=Al, Mn) in High Magnetic Fields, and Crystalーfield Analysis" Physical Review B. 42. 10291-297 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] D.W. I,im: "Firstーorder Magnetization Process in (NdーY)_2Fe_<14>B and (NdーLa)_2Fe_<14>B Single Crystals" Journal of Magnetism & Magnetic Materials. 90&91. 72-74 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] D.W. Lim: "Highーfield Magnetization Process and Spin Reorientation in (Nd_<1ーx>Dy_x)_2Fe_<14>B Single Crystals" Physical Review B. (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] D.W. I,im: "Spin Reorientation and Firstーorder Magnetization Process in (Er_<1ーx>Tb_x)_2Fe_<14>B" Journal of Magnetism & Magnetic Materials. (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Y. Nakagawa, H. Kato, D. W. Lim, G. Kido and M. Yamada :"High-field Measurements and Crystal-field Caluculations on Magnetic Properties of Nd_2Fe_<14>B-type Alloys" Proc. Int. Symposium on Magnetic Anisotropy and Coercivity in Rare Earth-Transition Metal Allosy, Pittsburgh 1990,. 12-35

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] M. C. D. Deruelle, M. Yamada, Y. Yamauchi, and Y. Nakagawa: "Magnetic Properties of Nd_2(Fe_<1-x>M_x)_<14>B Single Crystals (M=Al, Mn) in High Magnetic Fields, and Crystal-field Analysis" Phys. Rev. B. 42. 10291-10297 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] D. W. Lim, H. Kato, M. Yamada, G. Kido, Y. Nakagawa and S. Hirosawa: "First-order Magnetization Process in (Nd-Y)_2Fe_<14>B and (Nd-La)_2Fe_<14>B Single Crystals" J. Magn. Magn. Mater. 90&91. 72 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] D. W. Lim, H. Kato, M. Yamada, G. Kido, and Y. Nakagawa: "High-field Magnetization Process and Spin Reorientation in (Nd_<1-x>Dy_x)_2Fe_<14>B single crystals" Phys. Rev. B. (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] D. W. Lim, H. Kato, M. Yamada, G. Kido, and Y. Nakagawa: "Spin Reorientation and First-order Magnetization Process in (Er_<1-x>Tb_x)_2Fe_<14>B" J. Magn. Magr. Mater.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Y.Nakagawa: "Highーfield Measurements and Crystalーfield Calculations on Magnetic Properties of Nd_2Fe_<14>BーType Alloys" Proc.Int.Symposium on Magnetic Anisotropy and Coercivity in Rare EarthーTransition Metal Alloys.Pittsburgh. 12-35 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] M.C.D.Deruelle: "Magnetic Properties of Nd_2(Fe_<1ーX>M_X)_<14>B Single Crystals (M=Al,Mn) in High Magnetic Fields,and Crystalーfield Analysis" Physical Review B. 42. 10291-297 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] D.W.Lim: "Firstーorder Magnetization Proces in (NdーY)_2Fe_<14>B and (NdーLa)_2Fe_<14>B Single Crystals" Journal of Magnetism & Magnetic Materials. 90&91. 72-74 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] D.W.Lim: "Highーfield Magnetization Process and Spin Reorientation in (Nd_<1ーX>Dy_X)_2Fe_<14>B Single Crystals" Physical Review B. (1991)

    • Related Report
      1990 Annual Research Report
  • [Publications] D.W.Lim: "Spin Reorientation and FirstーOrder Magnetization Process in (Er_<1ーX>Tb_X)_2Fe_<14>B" Journal of Magnetism & Magnetic Materials. (1991)

    • Related Report
      1990 Annual Research Report
  • [Publications] Y.Nakagawa: "Magnetization of Nd2Fe14B-type compounds in high magnetic fields" Physica B 155. 155. 279-282 (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] Y.Nakagawa: "Magnetic anisotropy and crystalline electric field in multi-component Nd_2Fe_<14>B-type alloys" Proceedings of International Workshop on Rare-Earth and Their Applications,Kyoto. 1. 33-42 (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] D.W.Lim: "First-order magnetization process in(Nd-Y)_2Fe_<14>B and(Nd-La)_2Fe_<14>B single crystals" Journal of Magnetism & Magnetic Materials. (1990)

    • Related Report
      1989 Annual Research Report

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Published: 1989-04-01   Modified: 2016-04-21  

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