GENERATION OF MESOSCOPIC MAGNETIC-STRUCTURES BY LOCAL LASER ACTION

New effects are observed wherein the internal structure of the domain walls in a thin magnetic iron garnet film are modified by the action o f focused laser radiation. A single laser pulse with increasing power gives rise to the following: 1) displacement of vertical Bloch lines i n a domain wall; 2) generation of a pair of vertical Bloch lines on in itially line-free walls; and, 3) an irreversible change in shape of a domain wall and the domain structure as a whole. The mechanism leading to the generation and displacement of Bloch lines is connected with t he motion of domain walls which is induced by a local change in the di stribution of demagnetizing fields as a result of a heating-induced de crease of the magnetization in the focal spot of the laser radiation. (C) 1997 American Institute of Physics.