Vortex-assisted domain wall depinning and propagation in notched nanowires
1 Physics Department, The Hong Kong
University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, P.R.
2 HKUST Shenzhen Research Institute, Shenzhen 518057, P.R. China
Received in final form: 27 May 2015
Published online: 2 September 2015
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.
Key words: Solid State and Materials
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2015