Magnetic Field Dependence of Critical Attenuation in Ferromagnet

Abstract

The inuence of magnetic eld on the sound attenuation is investigated in ferromagnets. With the aid of the Nelson method we derive frequency-, magnetic eld-and temperature-dependent expression for the sound attenuation coecient near a critical point in the Ising-type system. The shift of the ultrasonic attenuation peak under the inuence of magnetic eld towards higher temperatures is discussed.