Monday, April 22, 2013

1304.5323 (C. J. Aas et al.)

Effects of composition and chemical disorder on the magnetocrystalline
anisotropy of Fe_{x}Pt_{1-x} alloys
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C. J. Aas, L. Szunyogh, R. W. Chantrell
We perform first principles calculations of the magnetocrystalline anisotropy energy (MAE) of the L1_{0}-like Fe_{x}Pt_{1-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 L1_{0} FePt structure.
View original: http://arxiv.org/abs/1304.5323

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