On the problem of damping of ferromagnetic spin waves by conduction electrons

The life time of a resonance spin wave has been studied in ferromagnetic transition metals utilizing the theory of generalized Brown's motion. A basic assumption is the exchange interaction of 3d electrons with the damped excitations of 4s electron spins. It is shown, that a result can be obtained in a form, which is simpler and physically more evident than the one derived using Green's functions.Na Slovance 2, Praha 8, Czechoslovakia.The authors wish to express their thanks to Z. Frait, V. Kamberský and L. Murtinová for valuable discussions and comments on the paper.