Ultrasonic Attenuation in Magnetic Single Crystals

A striking connection has been found between the magnetic properties and the ultrasonic attenuation properties of a nickel single crystal. The magnetic anisotropy has been detected by measuring the attenuation as a function of applied field intensity. Information about the vibrations of Bloch walls and the number of vibrating walls per unit length has also been obtained. The dependence of the attenuation on magnetic induction for 5-100 mc shear and longitudinal waves propagated in the [110] direction was the same for $B$ parallel to both the [111] and [001] directions. The shear modes induce much greater losses than the longitudinal mode.