  Local aspects of magnetism of disordered FePt are investigated by ab initio
fully relativistic full potential calculations, employing the supercell
approach and the coherent potential approximation (CPA). The focus is on trends
of the spin and orbital magnetic moments with chemical composition and with
bond lengths around the Fe and Pt atoms. A small but distinct difference
between average magnetic moments obtained when using the supercells and when
relying on the CPA is identified and linked to the neglect of the Madelung
potential in the CPA.
