Dependence of Sound Velocity on Magnetic Field Intensity and Orientation in Iron

The velocity of 10-MHz sound waves in iron single crystals has been measured as a function of magnetic field intensity and orientation at room temperature. Changes of the order of 0.1% in the velocity with the field intensity and orientation were observed. Within a phase of $\frac{\pi }{2}$, a ${cos}^2\theta$ dependence on orientation was observed. A comparison is made with previous results on nickel.