Suppression of complex domain wall behavior in Ni_(80)Fe_(20) nanowires by oscillating magnetic fields

摘要

We have studied the field-induced propagation of domain walls (DW) in 750 nm wide magnetic nanowires by time-resolved magneto-optical Kerr microscopy. Two different DW propagation modes are observed, separated by the so-called Walker breakdown (WB), with velocities ranging from 250 till 500 m/s. At WB, a velocity decrease occurs because of a complex evolution of the DW shape. Through simulations and experiments, we demonstrate a method to suppress this complex DW behavior at WB by superimposing an oscillating magnetic field H_(osc), parallel to the switching field H_(eff), at frequencies ranging from 200 to 600 MHz.