The dispersion equations of magnetostatic spin wave modes in thin ferromagnetic plates are derived within the linear phenomenological theory for a general anisotropic tensor of the dynamic susceptibility (Polder tensor). The equations are discussed for the two special cases of the effective magnetic field being parallel or perpendicular to the surface of the plate. In the Appendix the Polder tensor is derived for crystals with an anisotropic gyromagnetic ratio.
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B. Schneider (1972) studied this question.
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