Direct observation of high velocity current induced domain wall motion

Heyne, L.; Rhensius, J.; Bisig, A.; Krzyk, S.; Punke, P.; Kläui, M.; Heyderman, L. J.; Le Guyader, L.; Nolting, F.
January 2010
Applied Physics Letters;1/18/2010, Vol. 96 Issue 3, p032504
Academic Journal
We study fast vortex wall propagation in Permalloy wires induced by 3 ns short current pulses with sub 100 ps rise time using high resolution magnetic imaging at zero field. We find a constant domain wall displacement after each current pulse as well as current induced domain wall structure changes, even at these very short timescales. The domain wall velocities are found to be above 100 m/s and independent of the domain wall spin structure. Comparison to experiments with longer pulses points to the pulse shape as the origin of the high velocities.


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