The existence of uniaxial magnetic surface anisotropy in Permalloy films has been deduced by comparing the theoretical and experimental spin-wave-resonance spectra of several films with different thicknesses. The anisotropy decreases as the film thickness decreases and, for the thinnest film, becomes comparable to that given by N\'eel's theory (+0.08 erg/cm²).
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Bailey et al. (1973) studied this question.
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