Effects of composition and chemical disorder on the magnetocrystalline anisotropy of FexPt1−x alloys

Aas, C. J. and Szunyogh, László and Chantrell, RW (2013) Effects of composition and chemical disorder on the magnetocrystalline anisotropy of FexPt1−x alloys. EUROPHYSICS LETTERS, 102 (5). ISSN 0295-5075

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Abstract

We perform first principles calculations of the magnetocrystalline anisotropy energy (MAE) of the L10-like FexPt1−x samples studied experimentally by Barmak and co-workers in [J. Appl. Phys. 98 (2005) 033904]. The variation of composition and long-range chemical order in the samples was studied in terms of the coherent potential approximation. In accordance with experimental observations, we find that, in the presence of long-range chemical disorder, Fe-rich samples exhibit a larger MAE than stoichiometric FePt. By considering the site- and species-resolved contributions to the MAE, we infer that the MAE is primarily a function of the degree of completeness of the nominal Fe layers in the L10 FePt structure

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