arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1501.05366cond-mat.mes-hallcond-mat.mtrl-sci
收藏

自旋织构的拓扑保护动力学

Topologically Protected Dynamics of Spin Textures

O. A. Tretiakov, Ar. Abanov

摘要:

我们研究了薄磁性纳米线中自旋织构的电流诱导动力学。我们推导出有效的运动方程描述与拓扑缺陷的畴壁软模式的动力学。由于磁畴壁是拓扑对象,因此这些方程是通用的并且仅取决于少数参数。我们得到了具有Dzyaloshinskiii-Moriya相互作用的铁磁线中的自旋螺旋畴壁结构和临界电流对这种相互作用的依赖关系。我们还找到了最有效的方式来移动的畴壁的谐振电流脉冲,并提出了一个程序来确定其动态通过测量移动畴壁引起的电压。基于非恒定的纳米线,我们展示了如何使未来的磁存储纳米器件更加节能。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑