Dimensional Magnetoacoustic Effects in Resonant Scattering of Longitudinal Phonons by a Layered Magnetic Structure

The indirect spin–spin interaction through the field of virtual phonons polarized in the plane of incidence in a magnetic layer with slip boundaries in an unbounded nonmagnetic medium can lead to the appearance of bound states of magnon polarons in the continuous spectrum of radiative bulk Lamb magnetoacoustic modes. If a longitudinal plane bulk elastic wave is incident on this layer from outside, this mechanism ensures both the formation of magnetoacoustic Fano resonance and its collapse, as well as the implementation of the acoustic superradiance effect for a finite system of equidistant magnetic layers. The incidence of a quasiplane longitudinal wave can be accompanied by a sharp enhancement of the angular Shoch effect.