Magnetic Field Dependence of Critical Attenuation in Ferromagnet
A. Pawlak
Faculty of Physics, Adam Mickiewicz University, Umultowska 85, 61-614 PoznaƄ, Poland
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The influence of magnetic field on the sound attenuation is investigated in ferromagnets. With the aid of the Nelson method we derive frequency-, magnetic field- and temperature-dependent expression for the sound attenuation coefficient near a critical point in the Ising-type system. The shift of the ultrasonic attenuation peak under the influence of magnetic field towards higher temperatures is discussed.
DOI: 10.12693/APhysPolA.121.1185
PACS numbers: 05.70.Jk, 62.65.+k