The magnon damping in an electron-magnon system in the presence of an electromagnetic wave is discussed. It is found that in the strong-field limit only multiphoton absorption processes are significant and as a result the magnon population grows with time. A numerical estimate of the actual growth rate is given for a typical ferromagnetic semiconductor like CdCr₂{Se}₄$.
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Coutinho et al. (1977) studied this question.
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