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AbstractAbstract
[en] The propagation of magnetic excitations in amorphous ferromagnets is studied from the point of view of the theory of random frequency modulation. It is shown that the spin waves in the hydrodynamic limit are well described by perturbation theory while the roton-like magnetic excitations with wavevector about the peak in the structure factor are not. A criterion of validity of perturbation theory is found which is identical to a narrowing condition in magnetic resonance. (author)
[pt]
Estuda-se a propagacao de excitacoes magneticas em ferromagnetos amorfos do ponto de vista da teoria da modulacao aleatoria de frequencia. Mostra-se que as ondas de spin no limite termodinamico sao bem descritas por teoria de perturbacao enquanto que as excitacoes magneticas do tipo roton com vetor de onda sobre o pico no fator de estrutura nao o sao. Encontra-se um criterio de validade da teoria de perturbacao que e identica a uma condicao de diminuicao na resonancia magnetica. (L.C.)Source
nd; 25 p; Submitted to Physica Status Solidi.
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