Journal
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volume 322, Issue 9-12, Pages 1363-1367Publisher
ELSEVIER
DOI: 10.1016/j.jmmm.2009.09.026
Keywords
Domain wall displacement; Spin transfer; Magnetic nanowire; Shape effect; Modulated width
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We model current-induced domain wall motion in magnetic nanowires with the variable width. Employing the collective coordinate method we trace the wall dynamics. The effect of the width modulation is implemented by spatial dependence of an effective magnetic field. The wall destination in the potential energy landscape due to the magnetic anisotropy and the spatial nonuniformity is obtained as a function of the current density. For a nanowire of a periodically modulated width, we identify three (pinned, nonlinear, and linear) current density regimes for current-induced wall motion. The threshold current densities depend on the pulse duration as well as the magnitude of wire modulation. In the nonlinear regime, application of ns order current pulses results in wall displacement which opposes or exceeds the prediction of the spin transfer mechanism. The finding explains stochastic nature of the domain wall displacement observed in recent experiments. (C) 2009 Elsevier B.V. All rights reserved.
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