DIRECT OPTICAL OBSERVATION OF VERTICAL BLOCH LINES PROPAGATION BY INPLANE FIELD PULSES

Vertical Bloch line (VBL) motion in response to the in-plane field pul ses was studied by the methods of polarized anisotropic dark field obs ervation (PADO) and high-speed photography in bubble garnets. The mobi lity of VBLs and their velocities were measured. New types of PADO pic tures which are connected with the dynamic changes of VBL and domain w all structures were observed in nonlinear region of Bloch line motion. Difference in the dynamic behavior of VBLs of different types was obs erved. A qualitative discussion of the origin of PADO contrast feature s and VBLs behavior difference is proposed.