Theory of light scattering by spin waves

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Abstract
Recent light scattering experiments probe the surface response of ferromagnets in the regime where both exchange and dipolar interactions are important. We discuss the theory for the response of a semi‐infinite ferromagnet in this region within a continuum theory. We study the spectral density of surface spin fluctuations. This is used to calculate light scattering from spin waves. The light scattering spectra contain features resulting from interactions with both bulk and surface magnons. Our calculations give a good account of the experimental data reported for EuO and Fe.