We report a counter-intuitive finding that notches in an otherwise homogeneous magnetic nanowire can boost current-induced domain wall (DW) propagation. DW motion in notch-modulated wires can be classified into three phases: 1) A DW is pinned around a notch when the current density is below the depinning current density. 2) DW propagation velocity is boosted by notches above the depinning current density and when non-adiabatic spin-transfer torque strength β is smaller than the Gilbert damping constant α. The boost can be manyfold. 3) DW propagation velocity is hindered when β>α. The results are explained by using the Thiele equation.
@article{arxiv.1507.06748,
title = {Boosting Domain Wall Propagation by Notches},
author = {H. Y. Yuan and X. R. Wang},
journal= {arXiv preprint arXiv:1507.06748},
year = {2018}
}