Interaction of atomic order with itinerant ferromagnetism

The simultaneous occuring of atomic ordering and ferromagnetic ordering is described in a mean field approximation for an alloy where magnetic properties are due to the itinerant character of electrons: thus a generalization of the Stoner‐Wohlfarth model is proposed for the case of nondisordered ferromagnetic alloys. Treating first the non‐magnetic case, when the intra‐atomic correlation parameter U is not too high, a higher ordering temperature is obtained than in the Bragg‐Williams case; considering then the (weak) ferromagnetic case, also an increase of the Curie temperature is found. However, different situations can occur, according to the choice of the model density of states.