Abstract
We have investigated the motion of vortex domain walls passing across non symmetric triangular notches in single Permalloy nanowires. We have measured hysteresis cycles using the focused magneto-optical Kerr effect before and beyond the notch, which allowed to probe beyond the notch the occurrence probability of clockwise (CW) and counter-CW (CCW) walls in tail-to-tail (TT) and head-to-head (HH) configurations. We present experimental evidence of chirality flipping provided by the vortex–notch interaction. With a low exit angle, the probability of chirality flipping increases and here with the lowest angle of 15°, the probability of propagation of the energetically favored domain wall configuration (CCW for TT or CW for HH walls) is ≈75%. Micromagnetic simulations reveal details of the chirality reversal dynamics.
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