期刊
PHYSICAL REVIEW B
卷 80, 期 18, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.80.184405
关键词
current density; magnetic domain walls; nanowires; vortices
资金
- German Science Foundation [DFG SFB 513, SFB 767, KL1811]
- European Research Council Starting Independent Researcher [ERC2007-Stg 208162]
- EU RTN SPINSWITCH [MRTNCT-2006-035327]
- Samsung Advanced Institute of Technology
In a combined theoretical and experimental study, we investigate the critical current densities for vortex domain walls in magnetic nanowires. We systematically determine the critical current densities for continuous motion of vortex walls as a function of the wire width for different wire thicknesses and we find that the critical current density increases monotonously with decreasing wire width. Theoretically we present a mechanism that predicts a threshold current density based on wall transformations and this leads to a scaling of the critical current density j(c)proportional to 1/width. The origin of this scaling is found to be the different dependence of the spin torque energy and the vortex nucleation energy on the wire width and good agreement with the experimental observations is found.
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