Abstract
A modified formulation of the Damon-Eshbach theory of magnetostatic waves for in-plane magnetized anisotropic films is presented. New results, relative to the usual backward volume wave, nonreciprocal surface wave, and surface mode critical angle properties for isotropic films, are obtained for films with various anisotropies. These include: (i) Surface mode suppression. (ii) A second critical propagation angle for which the backward volume band of dispersion branches becomes inverted and the dispersion curves change to a forward volume mode character. (iii) Mode conversion and a reentrant mode character for the lowest order dispersion branch; a volume mode character at low wave number which converts to a surface character at high wave number. At the conversion point, this mode corresponds to a propagating plane wave with a uniform mode profile across the film thickness but at nonzero propagation wave number. (iv) A third critical in-plane propagation angle at which the surface mode dispersion branch vanishes and the lowest order branch reverts to a pure volume mode character.
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