We calculate the classical electromagnetic Green's functions for antiferromagnetic polaritons on a semi-infinite geometry. With damping present in the material, surface resonances are found that exist in frequency and wavelength regions forbidden to surface-polariton modes. These resonances are identified as magnetic analogs of the evanescent and Brewster modes found in plasmon-polariton studies. These antiferromagnetic surface resonances have finite path lengths and large penetration depths into the material which are very sensitive to material damping and externally applied fields.
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Stamps et al. (1989) studied this question.
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