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  Intrinsic 2D-XY ferromagnetism in a van der Waals monolayer

Bedoya-Pinto, A., Ji, J.-R., Pandeya, A. K., Gargiani, P., Valvidares, M., Sessi, P., et al. (2021). Intrinsic 2D-XY ferromagnetism in a van der Waals monolayer. Science, 374, 616-620. doi:10.1126/science.abd5146.

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Bedoya-Pinto, Amilcar1, Author              
Ji, Jing-Rong1, Author              
Pandeya, Avanindra K.1, Author              
Gargiani, Pierluigi2, Author
Valvidares, Manuel2, Author
Sessi, Paolo1, Author              
Taylor, James M.2, Author
Radu, Florin2, Author
Chang, Kai1, Author
Parkin, Stuart S. P.1, Author              
Affiliations:
1Nano-Systems from Ions, Spins and Electrons, Max Planck Institute of Microstructure Physics, Max Planck Society, ou_3287476              
2External Organizations, ou_persistent22              

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 Abstract: The physics and universality scaling of phase transitions in low-dimensional systems has historically been a topic of great interest. Recently, two-dimensional (2D) materials exhibiting intriguing long-range magnetic order have been in the spotlight. Although an out-of-plane anisotropy has been shown to stabilize 2D magnetic order, the demonstration of a 2D magnet with in-plane rotational symmetry has remained elusive. We constructed a nearly ideal easy-plane system, a single CrCl3 monolayer on graphene/6H-SiC(0001), and observed robust ferromagnetic ordering with critical scaling characteristic of a 2D-XY system. These observations indicate the realization of a finite-size Berezinskii-Kosterlitz-Thouless phase transition in a large-area, quasi–free-standing van der Waals monolayer magnet with an XY universality class. This offers a material platform to host 2D superfluid spin transport and topological magnetic textures.

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 Dates: 2021-10-292021-10-29
 Publication Status: Published in print
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 Identifiers: DOI: 10.1126/science.abd5146
arXiv: arXiv:2006.07605
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Title: Science
  Abbreviation : Science
Source Genre: Journal
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Publ. Info: Washington, D.C. : American Association for the Advancement of Science
Pages: - Volume / Issue: 374 Sequence Number: - Start / End Page: 616 - 620 Identifier: ISSN: 0036-8075
CoNE: https://pure.mpg.de/cone/journals/resource/991042748276600_1