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We perform first principles calculations of the magnetocrystalline anisotropyenergy (MAE) of the L1_{0}-like Fe_{x}Pt_{1-x} samples studied experimentallyby Barmak and co-workers in [J. Appl. Phys. 98 (2005) 033904]. The variation ofcomposition and long-range chemical order in the samples was studied in termsof the coherent potential approximation. In accordance with experimentalobservations, we find that, in the presence of long-range chemical disorder,Fe-rich samples exhibit a larger MAE than stoichiometric FePt. By consideringthe site- and species-resolved contributions to the MAE, we infer that the MAEis primarily a function of the degree of completeness of the nominal Fe layersin the L1_{0} FePt structure.

Effects of composition and chemical disorder on the magnetocrystalline anisotropy of Fe_{x}Pt_{1-x} alloys