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

Title
Universality of Dzyaloshinskii-Moriya interaction effect over domain-wall creep and flow regimes
Authors
민병철김덕호김대연유상철최석봉
Issue Date
2019-04
Publisher
Physical review B, Condensed matter and materials physics
Citation
VOL 99-134401-6
Abstract
Chirality causes diverse phenomena in nature such as the formation of biological molecules, antimatters, noncollinear 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 μ0HDMI, resulting in a peculiar DW speed variation in the DW creep regime. However, the role of μ0HDMI 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 μ0HDMI 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 DWmotion. The results manifest that the antisymmetric contribution from chiral effect vanishes gradually across the creep and flow regimes, revealing that the symmetric contribution from μ0HDMI is unchanged. Though the DWdynamics is governed by distinct mechanisms, the present observation demonstrates the uniqueness of the DMI effect on the DWs over the creep and flow regimes, suggesting that the DMI-induced magnetic field is indeed a fundamental quantity of given magnetic systems.
URI
http://pubs.kist.re.kr/handle/201004/69207
ISSN
2469-9950
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