Resonant transmission of electromagnetic energy through thick ferromagnetic films via phonons

The transmission lineshape is calculated for the case when exchange shift of the field, at which sound attenuation is a maximum, is comparable to the half-width of the ferromagnetic resonance. It is assumed that the d.c. magnetic field is perpendicular to the film and is directed along the axis [001] ; the r.f. magnetic field is applied in the plane of the film. A brief description of the main results of this article (formulae(13) - (15)) has recently been published.