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We demonstrate by means of fully relativistic first principles calculationsthat, by substitution of Fe by Cr, Mn, Co, Ni or Cu in FePt-L10 bulk alloys,with fixed Pt content, it is possible to tune the magnetocrystalline anisotropyenergy by adjusting the content of the non-magnetic species in the material.The changes in the geometry due to the inclusion of each element inducesdifferent values of the tetragonality and hence changes in the magneticanisotropy and in the net magnetic moment. The site resolved magnetic momentsof Fe increase with the X content whilst those of Pt and X are simultaneouslyreduced. The calculations are in good quantitative agreement with experimentaldata and demonstrate that models with fixed band structure but varying numbersof electrons per unit cell are insufficient to describe the experimental datafor doped FePt-L10 alloys.

Magnetic anisotropy of Fe_1-yX_yPt-L10 [X=Cr,Mn,Co,Ni,Cu] bulk alloys