Abstract
Current driven domain wall motion in curved Heavy Metal/Ferrimagnetic/Oxide multilayer strips is investigated using systematic micromagnetic simulations which account for spin-orbit coupling phenomena. Domain wall velocity and characteristic relaxation times are studied as functions of the geometry, curvature and width of the strip, at and out of the angular momentum compensation. Results show that domain walls can propagate faster and without a significant distortion in such strips in contrast to their ferromagnetic counterparts. Using an artificial system based on a straight strip with an equivalent current density distribution, we can discern its influence on the wall terminal velocity, as part of a more general geometrical influence due to the curved shape. Curved and narrow ferrimagnetic strips are promising candidates for designing high speed and fast response spintronic circuitry based on current-driven domain wall motion.
Highlights
A magnetic domain wall (DW) is the transition region that separates two uniformly magnetized domains [1]
Due to the several combination of parameters to consider in our study, we divided this section in three sub-sections: (A) The study on the influence of the strip width (w); (B) the study on curvature (ρ r−e 1); and (C) same studies for a straight strip with identical material parameters, to explore by comparison the effects of curvature on the DW dynamics
260 K and significantly increased, exceeding 2000 m/s for the narrowest strip as compared to ∼1800 m/s for the widest. These results suggest that the DWs velocities are equal for both types of DWs (UD and DU), which would lead to no distortion of the size of a domain between two adjacent DWs travelling along the curved strip
Summary
A magnetic domain wall (DW) is the transition region that separates two uniformly magnetized domains [1]. DW velocities of VDW ∼ 500 m/s have been reported upon injection of current densities of JHM ∼ 1 TA/m2 in Pt/Co/AlO [4] These stacks have been proposed to develop highly-packed magnetic recording devices, where the Current-Driven Domain Wall Motion information coded in the domains between DWs can be efficiently driven by pure electrical means. Both UD and DU DWs move with the same velocity along straight stacks, but some implementations of these memory or logic devices would require to design 2D circuits, where straight parts of HM/FM/Ox stack are connected each other with curved or semi-rings sections. Other systems must be proposed in order to design reliable 2D circuits for DW-based memory and logic devices
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