Universality of Dzyaloshinskii-Moriya interaction effect over domain-wall creep and flow regimes
| Autor: | Dae-Yun Kim, Duck-Ho Kim, Byoung-Chul Min, Sug-Bong Choe, Sang-Cheol Yoo |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Physics
Condensed Matter - Materials Science Condensed matter physics Antisymmetric relation Skyrmion Exchange interaction Materials Science (cond-mat.mtrl-sci) FOS: Physical sciences 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Universality (dynamical systems) Magnetic field Creep 0103 physical sciences Uniqueness 010306 general physics 0210 nano-technology Chirality (chemistry) |
| Zdroj: | Physical Review B. 99 |
| ISSN: | 2469-9969 2469-9950 |
| DOI: | 10.1103/physrevb.99.134401 |
| Popis: | 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. 19 pages, 4 figures |
| Databáze: | OpenAIRE |
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