Journal
EUROPEAN PHYSICAL JOURNAL B
Volume 88, Issue 9, Pages -Publisher
SPRINGER
DOI: 10.1140/epjb/e2015-60421-x
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Funding
- Hong Kong RGC [163011151, 605413]
- China NSFC [11374249]
- Hong Kong PhD Fellowship
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Various notches are often introduced in spintronics to trap a domain wall (DW). Common wisdom would expect notches to strengthen DW pinning and to hinder DW motion. Interestingly, our simulations show that notches help electric current to depin a DW with the assistance of vortex generation. The DW displacement is insensitive to notch geometry and current density. This phenomenon is explained by the Thiele equation. Moreover, a current density below the intrinsic threshold value, which is the minimum current to sustain continuous DW motion in a uniform nanowire, can induce a continuous DW propagation along a wire with a series of notches.
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