Abstract

The Landau-Lifshitz theory of ferromagnetic spin waves is generalized to amorphous ferromagnetic materials. It is shown that this theory predicts the existence of both extended and localized spin-wave states. The localized states are due to the randomness of the ferromagnet. It is postulated that the localized spin waves can be resonantly excited by means of a time-varying electromagnetic field. The anomalously large widths of the resonance lines observed in recent spin wave resonance experiments performed on amorphous thin nickel films can be explained in terms of the localized spin-wave states.

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