The dynamical pinning induced by thin layers of nickel on epitaxial permalloy films is investigated by stationary spin wave resonances at 17 and 35 GHz. The effective surface anisotropy is determined by comparing the location of resonance peaks for films without layer and for composite films. The high value and the d.c. field dependence of the effective surface anisotropy are attributed to the presence of exchange coupling between the films.
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Frank Hoffmann (1970) studied this question.
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