The initial stage in the nonlinear motion of a domain wall in garnet films

A study of the domain-wall motion in single-crystal garnet films of the YBiFeGa system with a perpendicular magnetic anisotropy, activated by a constant in-plane bias field H-p parallel to the wall plane and a pulsed drive field H-g of an amplitude corresponding to the nonlinear region of the domain-wall velocity vs. the H-g relation is reported. The earlier data suggesting the existence of an initial phase of motion, where the wall is accelerated to a high instantaneous velocity, have been confirmed. The wall behavior in the initial phase has been shown to be affected by the field H-p and the drive-field pulse rise time. A possible mechanism of the wall structure transformation after the application of the H-g pulse is considered. It has been established that the dependence of the wall velocity on H-p in the saturation region disagrees with theory. (C) 2000 MAIK "Nauka/ Interperiodica".