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Title: Room-temperature sub-100 nm Néel-type skyrmions in non-stoichiometric van der Waals ferromagnet Fe3-$$x$$GaTe2 with ultrafast laser writability

Journal Article · · Nature Communications
ORCiD logo [1];  [2];  [3];  [1];  [4];  [1];  [1];  [1];  [1]; ORCiD logo [2];  [5];  [5]; ORCiD logo [2]; ORCiD logo [6]; ORCiD logo [7]; ORCiD logo [2]; ORCiD logo [8]; ORCiD logo [1]
  1. Nankai Univ., Tianjin (China)
  2. South China Normal University (SCNU), Guangzhou (China)
  3. Guangdong University of Technology, Guangzhou (China)
  4. Aba Teachers University, Wenchuan (China)
  5. Chinese Academy of Sciences (CAS), Beijing (China)
  6. Peking Univ., Beijing (China)
  7. South China Normal University (SCNU), Guangzhou (China); Nanjing Univ. (China)
  8. Brookhaven National Laboratory (BNL), Upton, NY (United States)

Realizing room-temperature magnetic skyrmions in two-dimensional van der Waals ferromagnets offers unparalleled prospects for future spintronic applications. However, due to the intrinsic spin fluctuations that suppress atomic long-range magnetic order and the inherent inversion crystal symmetry that excludes the presence of the Dzyaloshinskii-Moriya interaction, achieving room-temperature skyrmions in 2D magnets remains a formidable challenge. In this study, we target room-temperature 2D magnet Fe3GaTe2 and unveil that the introduction of iron-deficient into this compound enables spatial inversion symmetry breaking, thus inducing a significant Dzyaloshinskii-Moriya interaction that brings about room-temperature Néel-type skyrmions with unprecedentedly small size. To further enhance the practical applications of this finding, we employ a homemade in-situ optical Lorentz transmission electron microscopy to demonstrate ultrafast writing of skyrmions in Fe3-$$x$$GaTe2 using a single femtosecond laser pulse. Our results manifest the Fe3-$$x$$GaTe2 as a promising building block for realizing skyrmion-based magneto-optical functionalities.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); National Natural Science Foundation of China (NSFC)
Grant/Contract Number:
SC0012704; 12304146; 11974191; 12127803; 52322108; 52271178; U22A20117; 12241403
OSTI ID:
2315621
Report Number(s):
BNL-225338-2024-JAAM
Journal Information:
Nature Communications, Vol. 15, Issue 1; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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