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May, 2024;36 (18): e2311022.

Magnetic Skyrmions above Room Temperature in a van der Waals Ferromagnet FeGaTe.

Chen Liu, Senfu Zhang, Hongyuan Hao, Hanin Algaidi, Yinchang Ma, Xi-Xiang Zhang
Author Information
  1. Chen Liu: Physical Science and Engineering Division (PSE), King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia. ORCID
  2. Senfu Zhang: Physical Science and Engineering Division (PSE), King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia.
  3. Hongyuan Hao: Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, Lanzhou University, Lanzhou, 730000, China.
  4. Hanin Algaidi: Physical Science and Engineering Division (PSE), King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia.
  5. Yinchang Ma: Physical Science and Engineering Division (PSE), King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia.
  6. Xi-Xiang Zhang: Physical Science and Engineering Division (PSE), King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia. ORCID
PMID: 38290153 DOI: 10.1002/adma.202311022

Abstract

2D van der Waals (vdW) ferromagnetic crystals are a promising platform for innovative spintronic devices based on magnetic skyrmions, thanks to their high flexibility and atomic thickness stability. However, room-temperature skyrmion-hosting vdW materials are scarce, which poses a challenge for practical applications. In this study, a chemical vapor transport (CVT) approach is employed to synthesize FeGaTe crystals and room-temperature Néel skyrmions are observed in FeGaTe nanoflakes above 58 nm in thickness through in situ Lorentz transmission electron microscopy (L-TEM). Upon an optimized field cooling procedure, zero-field hexagonal skyrmion lattices are successfully generated in nanoflakes with an extended thickness range (30-180 nm). Significantly, these skyrmion lattices remain stable up to 355 K, setting a new record for the highest temperature at which skyrmions can be hosted. The research establishes FeGaTe as an emerging above-room-temperature skyrmion-hosting vdW material, holding great promise for future spintronics.

Keywords

Fe3GaTe2 Lorentz transmission electron microscopy chemical vapor transport method magnetic skyrmions room temperature spintronics van der Waals ferromagnet

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Grants

  1. 12104197/National Natural Science Foundation of China
  2. ORFS-2022-CRG11-5031/King Abdullah University of Science and Technology
  3. ORFS-2021-CRG10-4665/King Abdullah University of Science and Technology
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