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arXiv 1608.01762cond-mat.mtrl-sci
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Dzyaloshinskiii-Moriya相互作用效应在畴壁蠕变和流动状态下的普适性

Universality of Dzyaloshinskii-Moriya interaction effect over domain-wall creep and flow regimes

Duck-Ho Kim, Sang-Cheol Yoo, Dae-Yun Kim, Byoung-Chul Min, Sug-Bong Choe

备注：
19 pages, 4 figures
发表信息：
Phys. Rev. B 99, 134401 (2019)
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摘要：

手征性在自然界中引起各种现象，例如生物分子、反物质、非共线自旋结构和磁性skyrmion的形成。磁性材料中的手征性通常是由非共线交换相互作用引起的，称为Dzyaloshinskiii-Moriya相互作用（Dzyaloshinskiii-Moriya interaction）。这种结构产生了拓扑自旋排列，如磁性skyrmion和手性畴壁（DW）。在手征DW中，双极晶体产生有效磁场$H_{DMI}$，导致DW蠕变区域中DW速度的特殊变化。然而，$H_{DMI}$在不同的DW-动力学制度的作用仍然难以捉摸，特别是由于最近观察到的蠕变和流动制度之间的不同行为。我们在此通过实验证明，$H_{DMI}$的作用在蠕变和流动状态下是不变的。在实验中，通过分解DW运动的对称和反对称贡献来量化纯扰动效应。结果表明，反对称的贡献逐渐消失的蠕变和流动的区域，揭示了对称的贡献$H_{DMI}$是不变的。虽然DW动力学是由不同的机制，目前的观察表明，在蠕变和流动制度的DW上的ESTA效应的独特性。

英文摘要：

Chirality causes diverse phenomena in nature such as the formation of biological molecules, antimatters, non-collinear spin structures, and magnetic skyrmions. The chirality in magnetic materials is often caused by the noncollinear exchange interaction, called the Dzyaloshinskii-Moriya interaction (DMI). The DMI produces topological spin alignments such as the magnetic skyrmions and chiral domain walls (DWs). In the chiral DWs, the DMI generates an effective magnetic field $H_{DMI}$, resulting in a peculiar DW speed variation in the DW creep regime. However, the role of $H_{DMI}$ over the different DW-dynamics regimes remains elusive, particularly due to recent observation of distinct behaviors between the creep and flow regimes. We hereby demonstrate experimentally that the role of $H_{DMI}$ is invariant over the creep and flow regimes. In the experiments, the pure DMI effect is quantified by decomposing the symmetric and antisymmetric contributions of the DW motion. The results manifest that the antisymmetric contribution vanishes gradually across the creep and flow regimes, revealing that the symmetric contribution from $H_{DMI}$ is unchanged. Though the DW dynamics is governed by distinct mechanisms, the present observation demonstrates the uniqueness of the DMI effect on the DWs over the creep and flow regimes.

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