Segregation Effects on the Magnetic Properties of Bimetallic Multilayers

The segregation effects on the magnetic properties of a system consisting of a magnetic slab on top of other that is paramagnetic are calculated. The Hamiltonian includes magnetic and chemical interactions and it is solved in the Bethe approximation. We discuss only the case in which the two components phase-separate in the bulk (i.e., CuNi, CuCo, etc.). One observes that the magnetic properties are strongly modified as compared to the case in which interdiffusion is not allowed. We present results for the CuNi system.