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

Weerts, K.; Van Roy, W.; Borghs, G.; Lagae, L.
February 2010
Applied Physics Letters;2/8/2010, Vol. 96 Issue 6, p062502
Academic Journal
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 Hosc, parallel to the switching field Heff, at frequencies ranging from 200 to 600 MHz.


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