Abstract
The free-electron theory of direct electromagnetic generation of ultrasound in metals is extended to include consideration of elastic anisotropy. It is shown that, for incidence along a direction for which transverse-acoustic waves exhibit anisotropy, the acoustic amplitude varies nonmonotonically with the intensity of an applied magnetic field ${B}_{0}$ independently of the scattering mechanism of the electrons at the surface of the metal. This is in contrast to the case of propagation along high-symmetry directions for which transverse-acoustic waves are degenerate where the nonmonotonic behavior of the acoustic amplitude with ${B}_{0}$ occurs only if the surface scattering is diffuse.
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