Visualizing the strongly reshaped skyrmion Hall effect in multilayer wire devices

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Visualizing the strongly reshaped skyrmion Hall effect in multilayer wire devices
Title:
Visualizing the strongly reshaped skyrmion Hall effect in multilayer wire devices
Journal Title:
Nature Communications
Keywords:
Publication Date:
12 July 2021
Citation:
Tan, A. K. C., Ho, P., Lourembam, J., Huang, L., Tan, H. K., Reichhardt, C. J. O., Reichhardt, C., & Soumyanarayanan, A. (2021). Visualizing the strongly reshaped skyrmion Hall effect in multilayer wire devices. Nature Communications, 12(1). https://doi.org/10.1038/s41467-021-24114-8
Abstract:
Magnetic skyrmions are nanoscale spin textures touted as next-generation computing elements. When subjected to lateral currents, skyrmions move at considerable speeds. Their topological charge results in an additional transverse deflection known as the skyrmion Hall effect (SkHE). While promising, their dynamic phenomenology with current, skyrmion size, geometric effects and disorder remain to be established. Here we report on the ensemble dynamics of individual skyrmions forming dense arrays in Pt/Co/MgO wires by examining over 20,000 instances of motion across currents and fields. The skyrmion speed reaches 24 m/s in the plastic flow regime and is surprisingly robust to positional and size variations. Meanwhile, the SkHE saturates at ∼22∘, is substantially reshaped by the wire edge, and crucially increases weakly with skyrmion size. Particle model simulations suggest that the SkHE size dependence — contrary to analytical predictions — arises from the interplay of intrinsic and pinning-driven effects. These results establish a robust framework to harness SkHE and achieve high-throughput skyrmion motion in wire devices.
License type:
Attribution 4.0 International (CC BY 4.0)
Funding Info:
This research / project is supported by the A*STAR - Singapore’s RIE2020 initiatives - SpOT-LITE programme
Grant Reference no. : A1818g0042, A18A6b0057

This research / project is supported by the A*STAR - Pharos Skyrmion programme
Grant Reference no. : 1527400026

This work is supported by the U.S. Department of Energy through the LANL/LDRD program. This work was also supported by the US Department of Energy through the Los Alamos National Laboratory.
Description:
ISSN:
2041-1723