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

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

doi:10.1126/sciadv.abm7103

Room-temperature skyrmion lattice in a layered magnet (Fe_0.5Co_0.5)₅GeTe₂

Journal Article · Fri Mar 25 00:00:00 EDT 2022 · Science Advances

DOI:https://doi.org/10.1126/sciadv.abm7103· OSTI ID:1877043

^[1]; ^[2]; ^[3]; Shao, Yu-Tsun ^[4]; Chen, Rui ^[5]; Chen, Xiang ^[6]; ^[1]; Reichanadter, Jonathan T. ^[1]; ^[5]; ^[5]; ^[1]; ^[4]; ^[5]; ^[2]; ^[6]; ^[3]; ^[4]; Birgeneau, Robert J. ^[6]; ^[5]

Univ. of California, Berkeley, CA (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Santa Cruz, CA (United States)
Rutgers Univ., Piscataway, NJ (United States)
Cornell Univ., Ithaca, NY (United States)
Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)

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, j_th = 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.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1877043

Journal Information:: Science Advances, Journal Name: Science Advances Journal Issue: 12 Vol. 8; ISSN 2375-2548

Publisher:: AAASCopyright Statement

Country of Publication:: United States

Language:: English

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