Variations of microwave transmission coefficient through Fe films and Fe/Cr superlattices have been studied caused by ferromagnetic resonance at frequencies from 26 to 38 GHz. The shape of resonance line is described in frames of the model where its asymmetry is obtained by adding of lorenzian dispersion line to the absorption line. It has been shown that the shape of resonance line for superlattices with continuous Fe and Cr layers and also for Fe films is well described in this model. For the superlattices with thin Fe or Cr layers only qualitative agreement is observed. In magnetic fields less than the field of ferromagnetic resonance, essential distinction is observed of experimental magnetic field dependence of transmission coefficient comparing to the model, for superlattices which have giant magnetoresistive effect.
Exact quantum-mechanical propagator for an electron in a saddle-point potential and a magnetic field
