Volume 69, Number 5, March 2005
|Page(s)||805 - 811|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||09 February 2005|
Temperature-dependent magnetic properties of : Effective spin Hamiltonian model
Seagate Research - 1251 Waterfront Place, Pittsburgh, PA 15222, USA
Accepted: 22 December 2004
A model of magnetic interactions in the ordered ferromagnetic is proposed on the basis of first-principles calculations of non-collinear magnetic configurations and shown to be capable of explaining recent measurements of magnetic-anisotropy energy (MAE). The site (,) resolved contributions to the MAE have been distinguished with small easy-plane and large easy-axis terms. This model has been tested against available experimental data on the temperature dependence of MAE showing scaling of uniaxial MAE () with magnetization characterized by the unusual exponent of . It is shown that this unusual behavior of the can be quantitatively explained within the proposed model and originates from an effective anisotropic exchange mediated by the induced moment. The latter is expected to be a common feature of - alloys having elements with large spin-orbit coupling and exchange-enhanced Stoner susceptibility.
PACS: 75.30.Gw – Magnetic anisotropy / 75.50.Ss – Magnetic recording materials / 71.15.Rf – Relativistic effects
© EDP Sciences, 2005
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