Elastic Wave Radiation from Simply-Vibrating 180° Magnetic Domain Walls

A vibrating magnetic domain wall generates elastic waves through magnetoelastic coupling. (Only the 180° ferromagnetic wall is considered here.) Using available parameters for ferrites, it is found that a plane vibrating 180° wall can generate shear waves, propagating normal to the wall, with a strain amplitude as high as 5 × 10⁻¹⁰.

Unfortunately, the parameters used may not be reliable at the frequencies of interest (Mc/s) and certain approximations of unknown validity have been made in arriving at the strain amplitudes. It seems as if the best test of the calculation would be an attempt to observe elastic wave generation by a single vibrating wall as in a “window-frame-crystal”.