Ferromagnetic thin films of binary alloys

We consider the ferromagnetic- and lattice-order-disorder phase transitions in thin films of the binary, AB3 type, alloys. The theory is based on the model consisting of both, magnetic and atomic interactions between nearest neighbour atoms belonging to the sublattices in the form of the monoatomic layers parallel to the surface. The main idea of the present description was applied at first by Valenta and Sukiennicki in the case of permalloy films for their order-disorder characterisation. The ferromagnetism together with the lattice long-range order was considered by Moran-Lopez and Falicov in bulk binary alloys. The present paper extends the above reference works to the case of the treatment for ferromagnetic and lattice disordering in thin films.