Ondes solitaires polaritoniques dans un ferroaimant quasi-unidimensionnel

Spin dynamics in an easy plane magnetic chain has been studied in terms of polaritons and solitons, when the coupling between magnons and their induced dipolar electromagnetic field is included. For a moderate external magnetic field in the easy plane, non-topoligical, classical ø⁴ solitons can describe the dynamics of spins dressed with the electromagnetic field. The solitary wave thus produced propagates at phase velocities bounded by the two limiting phase velocities of the polariton dispersion relations.