Scenario of a Dynamic Rearrangement of a Domain Wall in a Thin Film with a Perpendicular Anisotropy

Resumo

Features of motion and of the dynamic rearrangement of a domain wall (DW) have been studied in a thin film placed in an external magnetic field perpendicular to the surface of the film. It has been shown that in fields less than some critical magnitude the motion is quasi-stationary, and in overcritical fields the movement becomes periodic. A backward motion effect was observed in some time intervals. Periodic changes of the polarity of the magnetization distribution were detected. The maximum velocities of the forward and backward motion have been shown to be identical. The coincidence of the graphs of the velocities in the half-periods with the opposite polarity was revealed. The magnetization distributions observed upon the forward and backward motion, as well as upon the change of the polarity, were found to be spatially symmetric with respect to one another. The relationship between the graphs of the full energy of the DW and its velocity has been studied. It has been shown that the maximum and minimum of the energy correspond to the zeroes of the velocity.