Topologically protected dynamics of spin textures

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:383

Article; Proceedings Paper

Tretiakov, O. A.¹  Abanov, Ar.² 

[1] Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan

[2] Texas A&M Univ, Dept Phys & Astron, College Stn, TX 77843 USA

关键词: Domain walls dynamics;    Magnetic domain walls;    Ferromagnetic and antiferromagnetic nanowires;    Topological spin textures;   

DOI  :  10.1016/j.jmmm.2014.12.088

来源: Elsevier

【 摘 要 】

We study current induced dynamics of spin textures in thin magnetic nanowires. We derive effective equations of motion describing the dynamics of the domain wall soft modes associated with topological defects. Because the magnetic domain walls are topological objects, these equations are universal and depend only on a few parameters. We obtain spin spiral domain-wall structure in ferromagnetic wires with Dzyaloshinskii-Moriya interaction and critical current dependence on this interaction. We also find the most efficient way to move the domain walls by resonant current pulses and propose a procedure to determine their dynamics by measuring the voltage induced by a moving domain wall. Based On translationally non-invariant nanowires, we show how to make prospective magnetic memory nanodevices much more energy efficient. (C) 2015 Elsevier B.V. All rights reserved.

【 授权许可】

Free