Study of the velocity plateau of Dzyaloshinskii domain walls

Abstract

We study field-driven domain wall (DW) velocities in asymmetric multilayer stacks with perpendicular magnetic anisotropy and Dzyaloshinskii-Moriya interaction (DMI), both experimentally and by micromagnetic simulations. Using magneto-optical Kerr microscopy under intense and nanoseconds-long fields, we show that DWs in these films propagate at velocities up to hundreds of m/s and that, instead of the expected decrease of velocity after the Walker field, a long plateau with constant velocity is observed, before breakdown. Both the maximum speed and the field extent of the velocity plateau strongly depend on the values of the spontaneous magnetization and the DMI strength, as well as on the magnetic anisotropy. Micromagnetic simulations reproduce these features in sufficiently wide strips, even for perfect samples. A physical model explaining the microscopic origin of the velocity plateau is proposed.

arXiv comment10 pages, 9 figures

References in corpus (10)

• The design and verification of Mumax3
• Current-driven dynamics of chiral ferromagnetic domain walls
• Dynamics of Dzyaloshinskii domain walls in ultrathin magnetic films
• Domain wall tilting in the presence of the Dzyaloshinskii-Moriya interaction in out-of-plane magnetized magnetic nanotracks
• High domain wall velocities induced by current in ultrathin Pt/Co/AlOx wires with perpendicular magnetic anisotropy
• Soliton-like magnetic domain wall motion induced by the interfacial Dzyaloshinskii-Moriya interaction
• Very large domain wall velocities in Pt/Co/Gd trilayers with Dzyaloshinskii-Moriya interaction
• Magnetic domain wall Skyrmions
• Tuning domain wall velocity with Dzyaloshinskii-Moriya interaction
• Field-Driven Domain-Wall Dynamics in GaMnAs Films with Perpendicular Anisotropy

Cited by in corpus (7)

• Magnetic domain wall dynamics in the precessional regime: influence of the Dzyaloshinskii-Moriya interaction
• Theoretical study of current-induced domain wall motion in magnetic nanotubes with azimuthal domains, including Œrsted field and spin-transfer torques
• Magnetic domain wall substructures in Pt/Co/Ni/Ir multi-layers
• Stochastic processes in magnetization reversal involving domain wall motion in magnetic memory elements
• Spin-torque induced wall motion in perpendicularly magnetized discs: ballistic versus oscillatory behavior
• Tuning the dynamics of chiral domain walls of ferrimagnetic films with the magneto-ionic effect
• Deterministic roughening in the dc-driven precessional regime of domain walls