We derive effective-medium expressions, suitable for calculation of the properties of long-wavelength electromagnetic modes, for a magnetic superlattice in a magnetic field perpendicular to the interfaces. These are applied to a calculation of the dispersion relations for bulk and surface magnon polaritons of magnetic/nonmagnetic and magnetic/magnetic superlattices for both ferromagnetic and antiferromagnetic structures. Although we find no magnetostatic surface waves in such structures, in agreement with previous calculations, we predict retarded surface modes which are virtual. Such virtual modes have no magnetostatic limit.
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Elmzughi et al. (1995) studied this question.
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