Theory of acoustic analog of magneto-optic Kerr effect under   magnon-phonon resonance
  Theory of the acoustic analog of the polar Kerr effect is developed for an inclined incidence of the p-type wave on the interface between isotropic non-magnetic medium and ferromagnetic cubic crystal. Magnetic field dependences of ellipticity and rotation of the polarization plane of the reflected wave under magnon-phonon resonance are analysed in a weak-coupling approximation for interaction of magnetic and elastic subsystems. 
A. M. Burkhanov, K. B. Vlasov, V. V. Gudkov, B. V. Tarasov (Institute   for Metal Physics, Ural Department of the Russian Ac...