Damped surface modes in thick YIG epilayers which appear at low fields close to the Damon-Eshbach limit in microwave spectra with the dc magnetic field parallel to the surface have been investigated. The results are explained in terms of the De Wames–Wolfram model, when a surface anisotropy energy due to the effect of a diffusion layer on the spins at the substrate/film interface is taken into account. In accordance with the experimental results, the above theoretical assumption leads to a low value of the parallel wave vector ky for which those modes can be excited (≲103 cm−1).
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Borghese et al. (1980) studied this question.
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