Influence of disorder on the magneto-optical properties of FePt

A scheme to deal with the magneto-optical properties of randomly disordered alloys is presented. This aim is achieved by calculating the optical conductivity tensor σ(ω) for a number of ordered model compounds that differ in their atomic configuration within the unit cell but not in their composition. In a subsequent step the orientational and configurational average 〈σ(ω)〉 is taken. The magneto-optical properties are derived then from this in the conventional way. As it is demonstrated for FePt this approach accounts for the the influence of disorder on its magneto-optical properties in a very satisfying way. © 1997 Elsevier Science Ltd.