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Realizing high-velocity skyrmions via anisotropy engineering

Joy, A and Kayal, S and Anil Kumar, PS (2023) Realizing high-velocity skyrmions via anisotropy engineering. In: Applied Physics Letters, 122 (26).

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Official URL: https://doi.org/10.1063/5.0157280


Skyrmion-based racetrack memories are expected to be operated by the motion of skyrmions through magnetic nano-wires made of metallic multi-layers with high spin-orbit coupling and Dzyaloshinskii-Moriya interaction. The current-driven skyrmions in a ferromagnetic system had limitations due to their higher Hall angles and lower velocity. We addressed this by interfacial anisotropy engineering, which helped us to stabilize skyrmions at a thickness of x = 0.65 nm of Cu in the HM-FM interface of perpendicularly magnetized Ta 3 nm Pt 3 nm Cu x Co 0.5 nm Pt 1 nm . At x = 0.60 nm Cu, the system showed worm like structures, while at 0.70 nm of Cu, the system showed in-plane magnetization. This system with optimum magnetic anisotropy enabled one to achieve skyrmions with a velocity of 260 m/s and low skyrmion Hall effect at room temperature with driving current < 3 × 10 11 A / m 2 .

Item Type: Journal Article
Publication: Applied Physics Letters
Publisher: American Institute of Physics Inc.
Additional Information: The copyright for this article belongs to the Author.
Keywords: Nanowires, Current-driven; Dzyaloshinskii-Moriya interaction; Ferromagnetic systems; High spins; High velocity; Metallics; Multi-layers; Nano-wires; Skyrmions; Spin-orbit couplings, Magnetic anisotropy
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 28 Jul 2023 08:58
Last Modified: 28 Jul 2023 08:58
URI: https://eprints.iisc.ac.in/id/eprint/82579

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