Room-temperature skyrmion lattice in a layered magnet (Fe0.5Co0.5)5GeTe2

Novel magnetic ground states have been stabilized in two-dimensional (2D) magnets such as skyrmions, with the potential next-generation information technology. Here, we report the experimental observation of a Neel-type skyrmion lattice at room temperature in a single-phase, layered 2D magnet, specifically a 50% Co-doped Fe5GeTe2 (FCGT) system. The thickness-dependent magnetic domain size follows Kittel's law. The static spin textures and spin dynamics in FCGT nanoflakes were studied by Lorentz electron microscopy, variable-temperature magnetic force microscopy, micromagnetic simulations, and magnetotransport measurements. Current-induced skyrmion lattice motion was observed at room temperature, with a threshold current density, j(th) = 1 x 10(6) A/cm(2). This discovery of a skyrmion lattice at room temperature in a noncentrosymmetric material opens the way for layered device applications and provides an ideal platform for studies of topological and quantum effects in 2D.

Automated summary

In this study, a novel magnetic ground state, namely Néel-type skyrmion lattice, is observed at room temperature in a single-phase, layered 2D magnet. The relationship between thickness and magnetic domain size follows Kittel's law. The current-induced motion of the skyrmion lattice at room temperature is successfully observed. This discovery provides an important platform for layered device applications and studies of topological and quantum effects in 2D.