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Title: Two-dimensional itinerant ferromagnetism in atomically thin Fe 3GeTe 2

Abstract

Discoveries of intrinsic two-dimensional (2D) ferromagnetism in van der Waals (vdW) crystals provide an interesting arena for studying fundamental 2D magnetism and devices that employ localized spins1,2,3,4. However, an exfoliable vdW material that exhibits intrinsic 2D itinerant magnetism remains elusive. We demonstrate that Fe 3GeTe 2 (FGT), an exfoliable vdW magnet, exhibits robust 2D ferromagnetism with strong perpendicular anisotropy when thinned down to a monolayer. Layer-number-dependent studies reveal a crossover from 3D to 2D Ising ferromagnetism for thicknesses less than 4 nm (five layers), accompanied by a fast drop of the Curie temperature (T C) from 207 K to 130 K in the monolayer. For FGT flakes thicker than ~15 nm, a distinct magnetic behaviour emerges in an intermediate temperature range, which we show is due to the formation of labyrinthine domain patterns. Our work introduces an atomically thin ferromagnetic metal that could be useful for the study of controllable 2D itinerant ferromagnetism and for engineering spintronic vdW heterostructures5.

Authors:
 [1]; ORCiD logo [1];  [1]; ORCiD logo [2]; ORCiD logo [1];  [1]; ORCiD logo [3];  [4];  [5]; ORCiD logo [6]; ORCiD logo [2]; ORCiD logo [1];  [1]; ORCiD logo [7]
  1. Univ. of Washington, Seattle, WA (United States). Dept. of Physics
  2. Rutgers Univ., Piscataway, NJ (United States). Dept. of Physics and Astronomy
  3. Univ. of Hong Kong (China). Dept. of Physics and Center of Theoretical and Computational Physics
  4. Carnegie Mellon Univ., Pittsburgh, PA (United States). Dept. of Physics
  5. Columbia Univ., New York, NY (United States). Dept. of Chemistry
  6. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division
  7. Univ. of Washington, Seattle, WA (United States). Dept. of Physics and Dept. of Materials Science and Engineering
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; National Science Foundation (NSF); Croucher Foundation
OSTI Identifier:
1474480
Grant/Contract Number:  
[AC05-00OR22725; 1719797; SC0012509; DMR-1719797; DMR-1420634; SC0018153]
Resource Type:
Accepted Manuscript
Journal Name:
Nature Materials
Additional Journal Information:
[ Journal Volume: 17; Journal Issue: 9]; Journal ID: ISSN 1476-1122
Publisher:
Springer Nature - Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS

Citation Formats

Fei, Zaiyao, Huang, Bevin, Malinowski, Paul, Wang, Wenbo, Song, Tiancheng, Sanchez, Joshua, Yao, Wang, Xiao, Di, Zhu, Xiaoyang, May, Andrew F., Wu, Weida, Cobden, David H., Chu, Jiun-Haw, and Xu, Xiaodong. Two-dimensional itinerant ferromagnetism in atomically thin Fe3GeTe2. United States: N. p., 2018. Web. doi:10.1038/s41563-018-0149-7.
Fei, Zaiyao, Huang, Bevin, Malinowski, Paul, Wang, Wenbo, Song, Tiancheng, Sanchez, Joshua, Yao, Wang, Xiao, Di, Zhu, Xiaoyang, May, Andrew F., Wu, Weida, Cobden, David H., Chu, Jiun-Haw, & Xu, Xiaodong. Two-dimensional itinerant ferromagnetism in atomically thin Fe3GeTe2. United States. doi:10.1038/s41563-018-0149-7.
Fei, Zaiyao, Huang, Bevin, Malinowski, Paul, Wang, Wenbo, Song, Tiancheng, Sanchez, Joshua, Yao, Wang, Xiao, Di, Zhu, Xiaoyang, May, Andrew F., Wu, Weida, Cobden, David H., Chu, Jiun-Haw, and Xu, Xiaodong. Mon . "Two-dimensional itinerant ferromagnetism in atomically thin Fe3GeTe2". United States. doi:10.1038/s41563-018-0149-7. https://www.osti.gov/servlets/purl/1474480.
@article{osti_1474480,
title = {Two-dimensional itinerant ferromagnetism in atomically thin Fe3GeTe2},
author = {Fei, Zaiyao and Huang, Bevin and Malinowski, Paul and Wang, Wenbo and Song, Tiancheng and Sanchez, Joshua and Yao, Wang and Xiao, Di and Zhu, Xiaoyang and May, Andrew F. and Wu, Weida and Cobden, David H. and Chu, Jiun-Haw and Xu, Xiaodong},
abstractNote = {Discoveries of intrinsic two-dimensional (2D) ferromagnetism in van der Waals (vdW) crystals provide an interesting arena for studying fundamental 2D magnetism and devices that employ localized spins1,2,3,4. However, an exfoliable vdW material that exhibits intrinsic 2D itinerant magnetism remains elusive. We demonstrate that Fe3GeTe2 (FGT), an exfoliable vdW magnet, exhibits robust 2D ferromagnetism with strong perpendicular anisotropy when thinned down to a monolayer. Layer-number-dependent studies reveal a crossover from 3D to 2D Ising ferromagnetism for thicknesses less than 4 nm (five layers), accompanied by a fast drop of the Curie temperature (TC) from 207 K to 130 K in the monolayer. For FGT flakes thicker than ~15 nm, a distinct magnetic behaviour emerges in an intermediate temperature range, which we show is due to the formation of labyrinthine domain patterns. Our work introduces an atomically thin ferromagnetic metal that could be useful for the study of controllable 2D itinerant ferromagnetism and for engineering spintronic vdW heterostructures5.},
doi = {10.1038/s41563-018-0149-7},
journal = {Nature Materials},
number = [9],
volume = [17],
place = {United States},
year = {2018},
month = {8}
}

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    Works referencing / citing this record:

    High throughput computational screening for 2D ferromagnetic materials: the critical role of anisotropy and local correlations
    journal, July 2019