Boosting domain wall propagation by notches

被引：39

作者：

Yuan, H. Y.

Wang, X. R. ^{[1
]}

机构：

[1] Hong Kong Univ Sci & Technol, Dept Phys, Kowloon, Hong Kong, Peoples R China

来源：

PHYSICAL REVIEW B | 2015年 / 92卷 / 05期

基金：

中国国家自然科学基金;

关键词：

DYNAMICS; NANOWIRES; MOTION; FILMS;

D O I：

10.1103/PhysRevB.92.054419

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report a counterintuitive 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 nonadiabatic spin-transfer torque strength beta is smaller than the Gilbert damping constant alpha. The boost can be multifold. (3) DW propagation velocity is hindered when beta > alpha. The results are explained by using the Thiele equation.

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页数：8

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