Suppression of complex domain wall behavior in Ni80Fe20 nanowires by oscillating magnetic fields

摘要

We have studied the field-induced propagation of domain walls u0001DWu0002 in 750 nm wide magneticnnanowires by time-resolved magneto-optical Kerr microscopy. Two different DW propagationnmodes are observed, separated by the so-called Walker breakdown u0001WBu0002, with velocities rangingnfrom 250 till 500 m/s. At WB, a velocity decrease occurs because of a complex evolution of the DWnshape. Through simulations and experiments, we demonstrate a method to suppress this complexnDW behavior at WB by superimposing an oscillating magnetic field Hosc, parallel to the switchingnfield Hef f, at frequencies ranging from 200 to 600 MHz.