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.

• Received 29 July 1988

DOI:https://doi.org/10.1103/PhysRevB.40.596