Journal
JOURNAL OF APPLIED PHYSICS
Volume 117, Issue 5, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4906438
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Using micromagnetic simulations, the effects of the non-adiabatic spin torque (beta) and the geometry of nanowires on domain wall (DW) dynamics are investigated. For the case of in-plane anisotropy nanowire, it is observed that the type of DW and its dynamics depends on its dimension. For a fixed length, the critical switching current decreases almost exponentially with the width W, while the DW speed becomes faster for larger W. For the case of perpendicular anisotropy nanowire, it was observed that DW dynamics depends strongly on beta. For small values of beta, oscillations of DW around the center of nanowire were revealed even after the current is switched off. In addition to nanowire geometry and intrinsic material properties, beta could provide a way to control DW dynamics. (C) 2015 AIP Publishing LLC.
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