Self-assembly of Co/Pt stripes with current-induced domain wall motion towards 3D racetrack devices

Pavel Fedorov (), Ivan Soldatov, Volker Neu, Rudolf Schäfer, Oliver G. Schmidt () and Daniil Karnaushenko ()
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Pavel Fedorov: Chemnitz University of Technology
Ivan Soldatov: Leibniz Institute for Solid State and Materials Research
Volker Neu: Leibniz Institute for Solid State and Materials Research
Rudolf Schäfer: Leibniz Institute for Solid State and Materials Research
Oliver G. Schmidt: Chemnitz University of Technology
Daniil Karnaushenko: Chemnitz University of Technology

Nature Communications, 2024, vol. 15, issue 1, 1-12

Abstract: Abstract Modification of the magnetic properties under the induced strain and curvature is a promising avenue to build three-dimensional magnetic devices, based on the domain wall motion. So far, most of the studies with 3D magnetic structures were performed in the helixes and nanowires, mainly with stationary domain walls. In this study, we demonstrate the impact of 3D geometry, strain and curvature on the current-induced domain wall motion and spin-orbital torque efficiency in the heterostructure, realized via a self-assembly rolling technique on a polymeric platform. We introduce a complete 3D memory unit with write, read and store functionality, all based on the field-free domain wall motion. Additionally, we conducted a comparative analysis between 2D and 3D structures, particularly addressing the influence of heat during the electric current pulse sequences. Finally, we demonstrated a remarkable increase of 30% in spin-torque efficiency in 3D configuration.

Date: 2024
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DOI: 10.1038/s41467-024-46185-z

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