Local spin density functional approach to the theory of exchange interactions in ferromagnetic metals and alloys

Abstract Rigorous expressions for the exchange parameters of classical Heisenberg model applied to crystals are obtained using a local spin density functional (LSDF) approach and KKR-Green functions formalism. The spin wave stiffness constant and Curie temperature ( T c ) of ferromagnetic metals are obtained without any model assumptions as to the character of exchange interactions. The concentration dependence of T c for binary ferromagnetic alloys is investigated in the framework of the single-site CPA-theory. The corresponding calculations are carried out for simple metals Fe, Ni and disordered NiPd alloys.