Abstract
The frequency- and wavevector-dependent transverse magnetic spin susceptibility
matrix chi $_st$( rho , omega ) for a ferromagnet is studied at
T=0K within the local exchange (or X alpha ) approximation. General
formulae are obtained for a system of Bloch electrons. It is shown
that spin waves are obtained as elementary excitations. Applications
are made to the model of a ferromagnetic electron gas.
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