Resonant near-sound reorientation of the domain wall plane in yttrium orthoferrite

The dynamic orientation of the moving domain wall (DW) inclined at the static at an angle of about 50 degrees to the surface of the plate of the orthoferrite cut perpendicularly to the optical axis was investigated. in the process of the increase of the domain wall velocity a very sharp decrease of the visible thickness of DW takes place near the transversal sound velocity. The moving domain wall changes its orientation plane and becomes almost perpendicular to the plate. This result may be caused by renormalization of anisotropy or dynamic minimization of domain wall energy. The solitary defection wave can propagate along self-organizing structure in the domain wall as a result of supersonic instability. (C) 1996 American Institute of Physics.