The effect of acoustic paramagnetic resonance on the reflection of sound at the solid-Paramagnetic liquid interface

Abstract

The effect of an external magnetic field on the propagation of sound in a paramagnetic liquid is considered. It is shown that because of the interaction of molecular spins with the magnetic field and the interaction of the spins with the molecular orientation the resonant singularity appears in the spectra of the molecular orientation fluctuations. Due to this and to the coupling between orientational fluctuations and high-frequency shear waves in the liquid a number of peculiarities in the sound propagation arise. In particular, the reflection of sound is followed by rotation of the polarization plane and by changes of reflection coefficient.