Phys. Rev. Lett. 103, 197204 (2009) [4 pages]Dependence of Magnetic Domain-Wall Motion on a Fast Changing CurrentReceived 26 June 2009; published 6 November 2009 A dependence of current-induced domain-wall motion in nanowires on the temporal shape of current pulses is observed. The results show that the motion of the wall is amplified for alterations of the current on a time scale smaller than the intrinsic time scale of the domain wall which is a few nanoseconds in permalloy. This effect arises from an additional force on the wall by the spin-transfer torque due to a fast changing current and improves the efficiency of domain-wall motion. The observations provide an understanding for the efficient domain-wall motion with nanosecond current pulses. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.103.197204
DOI:
10.1103/PhysRevLett.103.197204
PACS:
75.60.Ch, 72.25.Ba, 75.75.+a, 85.75.−d
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