Magnetic anisotropy of disordered Mn-Pt layered surface compounds on Pt(111)

The magnetic moments and the anisotropy energy of surface compounds formed by MnxPt(12x) (x P@0,1# )o n aP t~111! substrate are calculated by means of the fully relativistic spin-polarized screened Korringa-Kohn-Rostoker method. The binary compositions are modeled within the coherent potential approximation. Different Mn concentrations at each layer have been considered in order to understand the influence on the magnetic properties of both the chemical environment of the Mn atoms and the segregation of Pt from the bulk. Special emphasis is devoted to the study of the layered sequences Pt/MnxPt(12x) .