Nonlinear polaritons in antiferromagnetic/nonmagnetic superlattices

We discuss nonlinear characteristics of surface and bulk magnetic polaritons in the AF/NM superlattices composed of nonlinear antiferromagnetic and linear nonmagnetic layers. The results obtained for nonlinear bulk modes show the unreciprocity omega(k)not equal omega(-k), and the existence of the attenuation or gain that indicates the modes unstable. The dispersion relations of surface polariton uncover clearly that there is a series of nonlinear surface eigenmodes, corresponding to the linear surface mode. The appearance of surface magnetic solitons may be possible in these superlattices.