Article Dans Une Revue EPL - Europhysics Letters Année : 2024

Spin-orbit torque-driven domain wall motion in the absence of Dzyaloshinskii-Moriya interactions

Dynamique de parois magnétiques par couple de transfert de spin en l'absence d'interaction Dzyaloshinskii-Moriya

Résumé

Abstract The fine structure and dynamics of magnetic domain walls in ultrathin films with perpendicular magnetization, in the presence of a secondary anisotropy, is analysed owing to micromagnetics. Two cases are considered, a cubic anisotropy typical for (111) oriented garnet epitaxial films, and an orthorhombic anisotropy as found in, e.g. , Co/W(110) films. The statics is solved first, showing that, in general, domain walls are not of the pure Bloch type. The dynamics under the spin Hall effect induced by a current flowing in an adjacent layer is then monitored. Finite and non-negligible domain wall velocities are predicted in both cases, in the absence of Dzyaloshinskii-Moriya interactions, with distinct behaviours regarding the current density and its orientation with respect to the secondary anisotropy axes. The relevance of these results to recent reports of current-driven domain wall dynamics in insulating ultrathin garnet films, capped with platinum, is discussed.

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hal-04748816 , version 1 (22-10-2024)

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André Thiaville, Jacques Miltat. Spin-orbit torque-driven domain wall motion in the absence of Dzyaloshinskii-Moriya interactions. EPL - Europhysics Letters, 2024, 146 (6), pp.66001. ⟨10.1209/0295-5075/ad4e62⟩. ⟨hal-04748816⟩
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