Skyrmion Topological Hall Effect near Room Temperature

Abstract

Magnetic skyrmions are stable nanosized spin structures that can be displaced at low electrical current densities. Because of these properties, they have been proposed as building blocks of future electronic devices with unprecedentedly high information density and low energy consumption. The electrical detection of skyrmions via the Topological Hall Effect (THE), has so far been demonstrated only at cryogenic temperatures. Here, we report the observation of a skyrmion Topological Hall Effect near room temperature (276 K) in a mesoscopic lamella of FeGe. This region unambiguously coincides with the skyrmion lattice location revealed by neutron scattering. We provide clear evidence of a reentrant helicoid magnetic phase adjacent to the skyrmion phase, and discuss the large THE amplitude (5 n$\Omega$.cm) in view of the ordinary Hall Effect.

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• General theory of topological Hall effect in systems with chiral spin textures
• Topological spiral magnetism in the Weyl semimetal SmAlSi
• Large anisotropic topological Hall effect in a hexagonal non-collinear magnet Fe5Sn3
• Skyrmion lattice creep at ultra-low current densities
• Complex magnetism of B20-MnGe: from spin-spirals, hedgehogs to monopoles
• Giant topological Hall effect in centrosymmetric tetragonal Mn2-xZnxSb
• Skyrmion phase in MnSi on sapphire grown by a conventional sputtering
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• Diverse Magnetic Phase Diagram and Anomalous Hall Effect in Antiferromagetic LuMn${}_6$Sn${}_6$
• Peculiar magnetic and magneto-transport properties in a non-centrosymmetric self-intercalated van der Waals ferromagnet Cr5Te8