Coulomb correlations and magnetic anisotropy in ordered L10 CoPt and FePt alloys -: art. no. 172407

We present the results of the magnetocrystalline anisotropy energy (MAE) calculations for chemically ordered L1(0) CoPt and FePt alloys taking into account the effects of strong electronic correlations and spin-orbit coupling. The local spin density and the Hubbard U approximation (LSDA+U) are shown to provide a consistent picture of the magnetic ground-state properties when intraatomic Coulomb correlations are included for both 3d and 5d elements. Our results demonstrate a significant and complex contribution of correlation effects to large MAE of these materials.