Observation of asymmetry in domain wall velocity under transverse magnetic field

被引：12

作者：

Kim, K. -J. ^{[1
]}

Yoshimura, Y. ^{[1
]}

Okuno, T. ^{[1
]}

Moriyama, T. ^{[1
]}

Lee, S. -W. ^{[2
]}

Lee, K. -J. ^{[2
,3
]}

Nakatani, Y. ^{[4
]}

Ono, T. ^{[1
]}

机构：

[1] Kyoto Univ, Inst Chem Res, Uji, Kyoto 6110011, Japan

[2] Korea Univ, Dept Mat Sci & Engn, Seoul 136701, South Korea

[3] Korea Univ, KU KIST Grad Sch Converging Sci & Technol, Seoul 136713, South Korea

[4] Univ Electrocommun, Chofu, Tokyo 1828585, Japan

来源：

APL MATERIALS | 2016年 / 4卷 / 03期

基金：

新加坡国家研究基金会; 日本学术振兴会;

关键词：

SPIN-TORQUE; DYNAMICS; SKYRMIONS; MOTION;

D O I：

10.1063/1.4944897

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The dynamics of a magnetic domain wall (DW) under a transverse magnetic field H-y are investigated in two-dimensional (2D) Co/Ni microstrips, where an interfacial Dzyaloshinskii-Moriya interaction (DMI) exists with DMI vector D lying in +y direction. The DW velocity exhibits asymmetric behavior for +/- H-y; that is, the DW velocity becomes faster when H-y is applied antiparallel to D. The key experimental results are reproduced in a 2D micromagnetic simulation, which reveals that the interfacial DMI suppresses the periodic change of the average DW angle phi even above the Walker breakdown and that H-y changes phi, resulting in a velocity asymmetry. This suggests that the 2D DW motion, despite its microscopic complexity, simply depends on the average angle of the DW and thus can be described using a one-dimensional soliton model. These findings provide insight into the magnetic DW dynamics in 2D systems, which are important for emerging spin-orbitronic applications. (C) 2016 Author(s).

引用

页数：7

共 36 条

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