Confinement of Skyrmions in Nanoscale FeGe Device-like Structures.

Autor:	Twitchett-Harrison AC; Department of Materials Science and Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge CB3 0FS, United Kingdom., Loudon JC; Department of Materials Science and Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge CB3 0FS, United Kingdom., Pepper RA; Faculty of Engineering and Physical Sciences, University of Southampton, Southampton SO17 1BJ, United Kingdom., Birch MT; Max Planck Institute for Intelligent Systems, 70569 Stuttgart, Germany.; Department of Physics, Durham University, Durham DH1 3LE, United Kingdom., Fangohr H; Faculty of Engineering and Physical Sciences, University of Southampton, Southampton SO17 1BJ, United Kingdom.; Max Planck Institute for Structure and Dynamics of Matter, Luruper Chaussee 149, 22761 Hamburg, Germany., Midgley PA; Department of Materials Science and Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge CB3 0FS, United Kingdom., Balakrishnan G; Department of Physics, University of Warwick, Coventry CV4 7AL, United Kingdom., Hatton PD; Department of Physics, Durham University, Durham DH1 3LE, United Kingdom.
Jazyk:	angličtina
Zdroj:	ACS applied electronic materials [ACS Appl Electron Mater] 2022 Sep 27; Vol. 4 (9), pp. 4427-4437. Date of Electronic Publication: 2022 Sep 07.
DOI:	10.1021/acsaelm.2c00692
Abstrakt:	Skyrmion-based devices have been proposed as a promising solution for low-energy data storage. These devices include racetrack or logic structures and require skyrmions to be confined in regions with dimensions comparable to the size of a single skyrmion. Here we examine skyrmions in FeGe device shapes using Lorentz transmission electron microscopy to reveal the consequences of skyrmion confinement in a device-like structure. Dumbbell-shaped elements were created by focused ion beam milling to provide regions where single skyrmions are confined adjacent to areas containing a skyrmion lattice. Simple block shapes of equivalent dimensions were also prepared to allow a direct comparison with skyrmion formation in a less complex, yet still confined, device geometry. The impact of applying a magnetic field and varying the temperature on the formation of skyrmions within the shapes was examined. This revealed that it is not just confinement within a small device structure that controls the position and number of skyrmions but that a complex device geometry changes the skyrmion behavior, including allowing skyrmions to form at lower applied magnetic fields than in simple shapes. The impact of edges in complex shapes is observed to be significant in changing the behavior of the magnetic textures formed. This could allow methods to be developed to control both the position and number of skyrmions within device structures. Competing Interests: The authors declare no competing financial interest. (© 2022 The Authors. Published by American Chemical Society.)
Databáze:	MEDLINE
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