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

Abstract

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

References in corpus (6)

• Creep and flow regimes of magnetic domain wall motion in ultrathin Pt/Co/Pt films with perpendicular anisotropy
• Soliton-like magnetic domain wall motion induced by the interfacial Dzyaloshinskii-Moriya interaction
• Chiral damping of magnetic domain walls
• Velocity asymmetry of Dzyaloshinskii domain walls in the creep and flow regimes
• Phenomenology of chiral damping in noncentrosymmetric magnets
• Drastic emergence of huge negative spin-transfer torque in atomically thin Co layers

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• Key points in the determination of the interfacial Dzyaloshinskii-Moriya interaction from asymmetric bubble domain expansion
• Determination of the energy of the Dzyaloshinskii-Moriya interaction in [Co/Pd(111)]5 superlattices with different Co thickness by micromagnetic simulations of labyrinth domain structures
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• Stabilizing current-driven steady flows of 180${}^{\circ }$ domain walls in spin valves by interfacial Dzyaloshinskii-Moriya interaction
• Chiral domain wall dynamics in magnetic heterostructures with bulk Dzyaloshinskii-Moriya interactions
• Slonczewski-spin-current driven dynamics of 180${}^{\circ }$ domain walls in spin valves with interfacial Dzyaloshinskii-Moriya interaction
• Distinct domain-wall motion between creep and flow regimes near the angular momentum compensation temperature of ferrimagnet
• Wide-Range Probing of Dzyaloshinskii-Moriya Interaction
• Angle-dependence and optimal design for magnetic bubblecade with maximum speed