Abstract
The reflection and transmission coefficients of an electromagnetic wave which is incident on the surface of a thin film of a ferromagnetic superconductor in the paramagnetic state are calculated. The model is based on the purely electrodynamical interaction between magnetic moments and superconducting order parameter. When using a Landau-Khalatnikov model for the dynamics of spins near their ordering temperature, one finds in addition to effects caused by the critical slowing down of the spin motion, a characteristic variation of the transmission coefficient with temperature which reflects the precursor effects of the transition into the coexistence state of a thin film. The consequences of a second-diffusive-type of spin motion are briefly discussed.
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