Skyrmion Topological Hall Effect near Room Temperature

TL;DR

This paper reports the first observation of the skyrmion Topological Hall Effect near room temperature in FeGe, demonstrating potential for practical skyrmion-based electronic devices.

Contribution

It provides the first experimental evidence of room-temperature skyrmion Topological Hall Effect in FeGe, linking it to the skyrmion lattice and magnetic phases.

Findings

Observation of THE at 276 K in FeGe

Correlation of THE with skyrmion lattice via neutron scattering

Identification of a reentrant helicoid magnetic phase

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.