Abstract
The wave dispersion relations of the mixed polariton-photon modes propagating along the surface of a semi-infinite layered structure consisting of alternating magnetic and nonmagnetic films are calculated. The magnetic films are magnetized to saturation by an external field parallel to the film plane and perpendicular to the wave propagation direction. Three different types of surface modes are found and discussed. The surface-surface-type and (lower) surface-bulk-type modes can exist in a general layered structure which, when propagating in the positive k direction, corresponds in magnetostatic limit to those surface modes found by Camley et al. For negative k propagation of surface-surface-type modes, different functional forms are approached in the magnetostatic limit depending on the value of permittivity of the nonmagnetic layers. A new type of surface waves, the upper surface-bulk-type modes, which do not exist in the magnetostatic regime, can arise only if the (optical) permeability of the magnetic medium is larger than the permittivity of the nonmagnetic medium. This is a situation similar to the occurrence of those negatively propagating surface modes in a single semi-infinite gyromagnetic medium as discussed by Hartstein. Among the three types of surface modes only the surface-surface-type modes show a great deal of nonreciprocity with respect to wave propagation directions.
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