Chemical-order-dependent magnetic anisotropy and exchange stiffness constant of FePt (001) epitaxial films

S. Okamoto, N. Kikuchi, O. Kitakami, T. Miyazaki, Y. Shimada, K. Fukamichi

Research output: Contribution to journalArticle

368 Citations (Scopus)

Abstract

Anomalous Hall voltage was measured for FePt L10 films having very high magnetic anisotropy. The magnetic anisotropy K1 and K2 were determined with high accuracy by analyzing the magnetization curves obtained from the Hall voltage measurement. The saturation magnetization Ms of the samples with different chemical-order parameter (S) exhibits a different temperature dependence, implying that the Curie temperature weakly depends on S. The first-order anisotropy K1 gradually increases with S, while the second-order anisotropy K2 remains almost constant of about 5 × 106 erg/cc. The temperature dependence of K1 is correlated with S, that is, K1 with a small S is more temperature dependent than that with a large S. These behaviors are quite similar to the temperature dependence of Ms with different S, and can be explained by the conventional model based on thermal spin fluctuations. The domain wall energy σw evaluated by the theoretical analysis of the stripe-domain structure tends to increase linearly with S, in a similar manner as that of K1, whereas the exchange stiffness constant A of about 1 × 10-6 erg/cm deduced from σw and Ku(=K1 + K2) hardly depends on S.

Original languageEnglish
Article number024413
Pages (from-to)244131-244139
Number of pages9
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume66
Issue number2
DOIs
Publication statusPublished - 2002 Jul 1

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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