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Temperature-dependent magnetic properties of FePt: Effective spin Hamiltonian model

Mryasov, O.N., Nowak, U., Guslienko, K.Y. and Chantrell, R.W. (2005) Temperature-dependent magnetic properties of FePt: Effective spin Hamiltonian model. Europhysics Letters, 69 (5). pp. 805-811. ISSN 0295-5075

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A model of magnetic interactions in the ordered ferromagnetic FePt 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 (Fe,Pt) resolved contributions to the MAE have been distinguished with small Fe easy-plane and large Pt easy-axis terms. This model has been tested against available experimental data on the temperature dependence of MAE showing scaling of uniaxial MAE (K1(T)) with magnetization (M(T)) K1(T) ~ M(T)γ characterized by the unusual exponent of γ = 2.1. It is shown that this unusual behavior of the FePt can be quantitatively explained within the proposed model and originates from an effective anisotropic exchange mediated by the induced Pt moment. The latter is expected to be a common feature of 3d-5d(4d) alloys having 5d/4d elements with large spin-orbit coupling and exchange-enhanced Stoner susceptibility.

Item Type: Article
Institution: The University of York
Academic Units: The University of York > Physics (York)
Depositing User: York RAE Import
Date Deposited: 25 May 2009 13:59
Last Modified: 25 May 2009 13:59
Published Version: http://dx.doi.org/10.1209/epl/i2004-10404-2
Status: Published
Publisher: EDP Sciences
Identification Number: 10.1209/epl/i2004-10404-2
URI: http://eprints.whiterose.ac.uk/id/eprint/6183

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