Polariton and effective-medium theory of magnetic superlattices

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Abstract
The retarded modes of a superlattice comprising alternating layers of two magnetic media characterized by a gyrotropic permeability tensor are investigated. The transfer matrix and dispersion relation are given in general form; a number of previous results are included as special cases. An effective-medium description, valid for long wavelengths, is derived first by expansion of the general result and second by general continuity arguments. Some numerical illustration of the effective-medium theory is given.

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