We investigate surface plasmon polariton waves at the interface between metals or metamaterials and gyrotropic dielectrics. Due to gyrotropy, the surface wave changes its polarization, propagation constant, and transverse profile. With the increase of gyrotropy the localization decreases leading to the existence of the critical value of the gyrotropic coefficient above which there are no localized surface-plasmons at the interface. A method of experimental investigation of gyrotropic films based on the surface-plasmon excitation is proposed.

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