Controlled Ordering of Room-Temperature Magnetic Skyrmions in a Polar Van der Waals Magnet

Abstract

Control and understanding of ensembles of skyrmions is important for realization of future technologies. In particular, the order-disorder transition associated with the 2D lattice of magnetic skyrmions can have significant implications for transport and other dynamic functionalities. To date, skyrmion ensembles have been primarily studied in bulk crystals, or as isolated skyrmions in thin film devices. Here, we investigate the condensation of the skyrmion phase at room temperature and zero field in a polar, Van der Waals magnet. We demonstrate that we can engineer an ordered skyrmion crystal through structural confinement on the $\mu$m scale, showing control over this order-disorder transition on scales relevant for device applications.

26 pages; 5 main text, 8 supplementary figures

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• Imaging Topological Defect Dynamics Mediating 2D Skyrmion Lattice Melting
• Engineering of a Layered Ferromagnet via Graphitization: An Overlooked Polymorph of GdAlSi
• Local Inversion Symmetry Breaking and Thermodynamic Evidence for Ferrimagnetism in Fe3GaTe2
• Robustness of topological magnons in disordered arrays of skyrmions
• Skyrmion Crystal in a Microwave Field
• Melting and Freezing of a Skyrmion Lattice
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• Skyrmion Lattice Domain Formation in a Non-Flat Energy Landscape
• Skyrmion Lattice Order Controlled by Confinement Geometry
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• Diffusionless relaxation of half-skyrmion liquid, hexatic, and crystalline states in a chiral molecular crystal