Dynamical spin susceptibility is calculated for the generalized ferromagnetic Kondo model which describes itinerant $e_{ g}$ electrons interacting with localized $t_{ 2g}$ electrons with antiferromagnetic coupling. The calculations done in the mean field approximation show that the spin-wave spectrum of the system in ferromagnetic state has two branches, acoustic and optic ones. Self-energy corrections to the spectrum are considered and the acoustic spin-wave damping is evaluated.
Categories: cond-mat.str-el