arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2007.00358cond-mat.mtrl-sci
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非共线框架下基于第一性原理的Dzyaloshinskii-Moriya相互作用

First-principles Dzyaloshinskii-Moriya interaction in a non-collinear framework

R. Cardias, A. Szilva, M. M. Bezerra-Neto, M. S. Ribeiro, A. Bergman, Y. O. Kvashnin, J. Fransson, A. B. Klautau, O. Eriksson, L. Nordström

AI总结:

本研究推导了非共线磁构型下可独立计算DM矢量三分量的DM相互作用表达式,基于RS-LMTO-ASA方法实现并通过表面金属三聚体验证,发现共线与非共线态DM相互作用差异显著,且非共线磁结构在无自旋轨道耦合时也能产生强DM相互作用。

摘要:

我们推导了适用于一般非共线磁构型的Dzyaloshinskii-Moriya(DM)相互作用表达式,其中DM矢量的三个分量均可独立计算。该形式体系已在实空间线性糕模轨道原子球近似(RS-LMTO-ASA)方法中实现。我们选取Au(111)表面的Cr三角形三聚体,以及Ag(111)、Au(111)表面的Mn三角形三聚体作为数值算例。结果表明,共线态与非共线态的DM相互作用(模长与方向)存在显著差异。基于系统中流动的自旋电流、电荷电流与三角形三聚体非共线磁构型的耦合关系,我们证明即使不存在自旋轨道耦合,DM相互作用仍可具有显著强度。研究表明这一效应源于非共线磁结构——即便忽略自旋轨道耦合,该结构也能诱导出显著的自旋与电荷电流。

英文摘要:

We have derived an expression of the Dzyaloshinskii-Moriya (DM) interaction, where all the three components of the DM vector can be calculated independently, for a general, non-collinear magnetic configuration. The formalism is implemented in a real space - linear muffin-tin orbital - atomic sphere approximation (RS-LMTO-ASA) method. We have chosen the Cr triangular trimer on Au(111) and Mn triangular trimers on Ag(111) and Au(111) surfaces as numerical examples. The results show that the DM interaction (module and direction) is drastically different for collinear and non-collinear states. Based on the relation between the spin and charge currents flowing in the system and their coupling to the non-collinear magnetic configuration of the triangular trimer, we demonstrate that the DM interaction can be significant, even in the absence of spin-orbit coupling. This is shown to emanate from the non-collinear magnetic structure, that can induce significant spin and charge currents even with spin-orbit coupling is ignored.

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。

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