Room-temperature skyrmion lattice in a layered magnet (Fe 0.5 Co 0.5 ) 5 GeTe 2-Reference-Cited by-同舟云学术

Room-temperature skyrmion lattice in a layered magnet (Fe _0.5 Co _0.5 ) ₅ GeTe ₂

Published:2022-03-25 Issue:12 Volume:8 Page:
ISSN:2375-2548
Container-title:Science Advances
language:en
Short-container-title:Sci. Adv.

Author:

Zhang Hongrui¹^ORCID,Raftrey David²³^ORCID,Chan Ying-Ting⁴^ORCID,Shao Yu-Tsun⁵,Chen Rui¹²,Chen Xiang²⁶,Huang Xiaoxi¹^ORCID,Reichanadter Jonathan T.⁷⁸,Dong Kaichen¹²^ORCID,Susarla Sandhya¹²^ORCID,Caretta Lucas¹^ORCID,Chen Zhen⁵^ORCID,Yao Jie¹²^ORCID,Fischer Peter²³^ORCID,Neaton Jeffrey B.²⁶⁹^ORCID,Wu Weida⁴^ORCID,Muller David A.⁵¹⁰^ORCID,Birgeneau Robert J.²⁶,Ramesh Ramamoorthy¹²⁶^ORCID

Affiliation:

1. Department of Materials Science and Engineering, University of California, Berkeley, Berkeley, CA, USA.

2. Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA.

3. Physics Department, University of California, Santa Cruz, Santa Cruz, CA, USA.

4. Department of Physics and Astronomy, Rutgers University, Piscataway, NJ, USA.

5. School of Applied and Engineering Physics, Cornell University, Ithaca, NY, USA.

6. Department of Physics, University of California, Berkeley, Berkeley, CA, USA.

7. Department of Electrical Engineering, University of California, Berkeley, Berkeley, CA, USA.

8. Department of Chemistry, University of California, Berkeley, Berkeley, CA, USA.

9. Kavli Energy Nanosciences Institute at Berkeley, Berkeley, CA, USA.

10. Kavli Institute at Cornell for Nanoscale Science, Cornell University, Ithaca, NY, USA.

Abstract

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 Fe 5 GeTe 2 (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 × 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.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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