Light scattering from thermal magnons in thin metallic ferromagnetic films

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Abstract
A computer program has been written with which the complex resonant frequency can be calculated for a thin ferromagnetic metal film sandwiched between a nonmagnetic metallic substrate and a nonmagnetic metallic overlayer. The calculation includes exchange and magnetic damping having the Gilbert form. The program has been used to investigate the sensitivity of thin-film resonant frequencies to the resistivities of the overlayer, the substrate, and the magnetic film. It is concluded that the presence of an overlayer and of a substrate are unimportant for the analysis of Brillouin scattering data from films less than 100 Å thick: uncertainties in the absolute value of the frequency shift of the scattered light—typically 1:200—are greater than, or comparable with, the frequency shifts caused by an overlayer or a substrate.