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The dispersion relations of the long-wavelength retarded magnetic modes of a ferromagnetic slab magnetized perpendicular to its plane are derived. A comparison with the magnetostatic Damon–van de Vaart [J. Appl. Phys. 36, 3453 (1965)] modes is presented, and the parameters affecting the deviations of the magnetostatic modes from the exact ones are discussed. The theory is applied to a calculation of the ferromagnetic resonance lines of an yttrium iron garnet film.
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R. Ruppin (1987) studied this question.
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