Lattice axial ratio and large uniaxial magnetocrystalline anisotropy in L10-type FePd single crystals prepared under compressive stress

H. Shima, K. Oikawa, Asaya Fujita, K. Fukamichi, K. Ishida, A. Sakuma

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72 Citations (Scopus)

Abstract

L10-type FePd single crystals with a high order degree were prepared by ordering under compressive stress. Experimental and theoretical investigations on the relation among the axial ratio, d electron number and magnetocrystalline anisotropy energy (MAE) in L10-type FePd single crystals have been carried out. In the concentration dependence of the lattice constants, the a axis exhibits a strong dependence, compared with that of the c axis. As a result, the ratio of c/a decreases with increasing Pd concentration. The uniaxial magnetocrystalline anisotropy constant Ku at the equiatomic composition is evaluated to be 2.1 × 107 erg/cm 3 at 4.2 K and 1.7 × 107 erg/cm3 at 300 K. The MAE becomes weaker as the ratio of c/a is apart from unity at higher Pd compositions. The calculated results by the first principles calculations with the LMTO-ASA including the spin-orbit coupling for the MAE of L1 0-type Fe50Pd50 are in accord with the present experimental results. The increase in the d electron number due to the increase of the Pd concentration facilitates the decrease of the MAE, cooperating with the decrease in the axial ratio c/a.

Original languageEnglish
Article number224408
Pages (from-to)224408-1-224408-7
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume70
Issue number22
DOIs
Publication statusPublished - 2004 Dec

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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