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  • Room-temperature skyrmion l...
    Zhang, Hongrui; Raftrey, David; Chan, Ying-Ting; Shao, Yu-Tsun; Chen, Rui; Chen, Xiang; Huang, Xiaoxi; Reichanadter, Jonathan T; Dong, Kaichen; Susarla, Sandhya; Caretta, Lucas; Chen, Zhen; Yao, Jie; Fischer, Peter; Neaton, Jeffrey B; Wu, Weida; Muller, David A; Birgeneau, Robert J; Ramesh, Ramamoorthy

    Science advances, 03/2022, Letnik: 8, Številka: 12
    Journal Article

    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 Néel-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, jth = 1 × 106 A/cm2. 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.