Formation of quasistationary states in a ferromagnetic plate by scattering of ultrasound pulse in the vicinity of magnetoacoustic resonance.

We study the scattering of ultrasound wave packet that normally falls on a ferromagnetic plate in the vicinity of the magnetoelastic resonance. The reflection and transmission amplitudes spectra contain zeros and poles, which are connected with the coupling of elastic and spin clockwise polarized waves. Two types of poles determining the wave field evolution and the formation of quasistationary states have been found. The results depend on the surface pinning of the spins, on the magnetic field, and the plate thickness. [ABSTRACT FROM AUTHOR]