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Theoretical Study of Spin-Orbit Coupling in Metallic Ferromagnetism

Research Project

Project/Area Number 06640468
Research Category

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

Allocation TypeSingle-year Grants
Research Field 固体物性Ⅱ(磁性・金属・低温)
Research InstitutionThe University of Tokyo

Principal Investigator

ASANO Setsuro  The University of Tokyo, College of Arts and Sciences, Professor., 教養学部, 教授 (80013499)

Project Period (FY) 1994 – 1995
Project Status Completed (Fiscal Year 1995)
Budget Amount *help
¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1995: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1994: ¥1,200,000 (Direct Cost: ¥1,200,000)
Keywordsinterstitially modifide intermetallics of Rare earth and Transition metals / spin-orbit coupling / perpendicular magnetic anisotropy / crystalline field / magnetic anisotropy / ferromagnetic multilayrs / metallic ferromagnetism / artificial superlattice / 強磁性金属 / ネオマックス / 窒化鉄 / SmCo_5 / Sm_2Fe_<17>N_3 / NdFe_<12>N / 電子構造
Research Abstract

The spin-orbit coupling is the only one interaction, which fixes the spin system to the lattice, but it is too small to make a reliable quantitative calculations in the case of 3d-transition metals. We have investigated the magnetic anisotropy energy (MAE) from the first-principles band calculations in the two cases : interstitially modified intermetallics of rare-earth (R) and 3d transition metals and X/Co or Fe (X=Pd, Pt, Ag, Au) ferromagnetic multilayr system. In the former case, the electronic structures of GdCo_5, GdFe_<12>, Gd_2Fe_<17>, GdFe_<12>N and Gd_2Fe_<17>N_3 were calculated by FLAPW method and the charge distribution around R ions were investigated carefully. Nitrogen interstitial ions make strong bondings with surrounding Fe and R ions. The bonding with Fe leads to a larger spin saturation moment, but that with R makes a strong aspherical charge distribution around R and a crystalline field (CF) as large as that of SmCo_5. We found that this large CF is the microscopic origin of the strong uniaxial magnetic anisotropy in these nitrides. In the case of X/Co or Fe system, the MAE were calculated systematically by the LMTO method including the spin-orbit interaction. We found that the general tendency of the MAE in these systems are well explained by first-principles calculations. The thickness of Co layr dependence and the strain dependence of the MAE were also investigated.

Report

(3 results)
  • 1995 Annual Research Report   Final Research Report Summary
  • 1994 Annual Research Report
  • Research Products

    (20 results)

All Other

All Publications (20 results)

  • [Publications] M.Yamaguchi: "Theoretical Calculation of the Cryotal Field Parameters of GdCo_5,GdFe_<12>、GdFe_<12>N,Gd_2Fe_<17> and Gd_2Fe_<17>N_3 Compounds" J. of Phys. Soc. Japan. 63. 1071-1080 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] S. Ishida: "Effects of N and Mo atoms on the magnetic properties of YFe_<12-x>Mox and YFe_<12-x>MoxN" Physica B. 193. 66-76 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] S. Fujii: "Electronic and Magnetic Properties of X_2Mn_<1-x>VxSi(X=Fe,Co)" J. of Phys. Soc. Japan. 63. 1881-1888 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] S. Ishida: "Search for Half-Mettallic Compounds in Co_2MnZ(Z=IIIb,IVb,Vb)Element" J. of Phys. Soc. Japan. 64. 2152-2157 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] K, Kyuno: "Theoretical study on the Co layer thicknees dependence of the magnetic anisotiopy of Pd/Co multilayers" Solid State Communicationsに発表予定.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] K, Kyuno: "Theoretical study on the Strain dependence of the magnetic anisotiopy of X/Co (X=Pt,Cu,Ag,Au)multilayers" J. of Applied Physics. (発表予定).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] M.Yamaguchi and S.Asano: "Theoretical Calculation of the Crystal Field Parameters of GdCo_5, GdFe_<12>, GdFe_<12>N,Gd_2Fe_<17>, and Gd_2Fe_<17>N_3 Compounds" J.Phys.Soc.Japan. 63. 1071-1080 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] S.Ishida, S.Asano and S.Fujii: "Effects of N and Mo atoms on the magnetic properties of YFe_<12-X>Mo_X and YFe_<12-X>Mo_XN." Physica. B193. 66-76 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] S.Fujii, S.Ishida and S.Asano: "Electronic and Magnetic Properties of X_2Mn_<1-X>V_XSi (X=Fe and Co)" J.Phys.Soc.Japan. 63. 1881-1888 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] S.Ishida, S.Fujii, S.Kashiwagi and S.Asano: "Search for Half-Metallic Compounds in Co_2MnZ (Z=IIIb, IVb, Vb Element)" J.Phys.Soc.Japan. 64. 2152-2157 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] K.Kyuno, R.Yamamoto and S.Asano: "Theoretical study on the Co layr thickness dependence of the magnetic anisotropy of Pd/Co multilayrs" Solid State Communications.(to be published).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] K.Kyuno, R.Yamamoto and S.Asano: "Theoretical study on the strain dependence of the magnetic anisotropy X/Co (X=Pt, Cu, Ag and Au) metallic multilayrs" Journal of Applied Physics.(to be published).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] S.Ishida: "Search for Half-Metallic Compounds in Co_2MuZ(Z=IIIb,IVb,Vb)Element" J.Phys.Soc.Japan. 64. 2152-2157 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] S.Ishida: "Magnetic and half-metallic properties of new Heusler alloys Ru_2MnZ(Z=S:,Ge,Sn and Sb)" Physica B. 210. 140-148 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] H.Fujitani: "Full-potential fand calculation on YTO_3 with a distorted perovoskite structure" phys.Rev.B. 51. 2098-2102 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] H.Fujitani: "The Physical Society of Japan" Computational Physics as a New Frontier in Condensed Mather Research. pp114-124 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] M.Yamaguchi: "Theoretical Calculation of the Crystal Field Parameters of GdCo_5,GdFe_<12>,GdFe_<12>N,Gd_2Fe_<17> and Gd_2Fe_<17>N Compounds" J.of Phys.Soc.Japan. 63. 1071-1080 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] S.Ishida: "Effects of N and Mo atoms on the mognetic properties of YFe_<12-x> Mox and YFe_<12-x> Mox N" Physica B. 193. 66-76 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] S.Fujii: "Electronic and Magnetic Properties of X_2M_<n1-x>V_xSi(X=Fe,Co)" J.of Phys.Soc.Japan. 63. 1881-1888 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] H.Fujitani: "Schottky-bamier height and electronic structure of the Si interface with CoSi_2,NiSi_2 and YSi_2" Physical Review B. 50. 8681-8698 (1994)

    • Related Report
      1994 Annual Research Report

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Published: 1994-04-01   Modified: 2020-05-15  

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