RELAXATION IN MAGNETIC CONTINUA

Within a recently developed axiomatic formalism for construction of st ochastic field equations of motion a new form of the equation for damp ed dynamics of magnetization in ferromagnets is proposed. It takes int o account spatially inhomogeneous dissipation due to exchange interact ions and replaces the customary dissipation constant (due to relativis tic effects) by a dissipation operator. This operator is constructed h ere by comparison of the resultant phenomenological spin wave spectra with results of microscopic calculations. Dynamic description of relax ation of the modulus of magnetization is discussed.