The angular dependence of the jump in domain-wall mobility in yttrium orthoferrite

Abstract

Using the Landau-Lifshitz equations and the equations for acoustic waves, the energy balance equation including magnetoelastic terms is written for the domain wall moving in an arbitrary direction. It is pointed out that the cusp in the magnetic field-velocity dependence, caused by the magnetoelastic interaction, exists for all three acoustic modes with the exception of the case when the domain wall moves along some special directions. The conditions determining these directions for longitudinal and transversal sound waves are written in the approximation that the tensors of elastic and damping constants are isotropic, and the modification of these special directions for the anisotropic case is evaluated by means of perturbation theory. This effect could be useful to measure the anisotropy of the magnetoelastic tensor.