期刊
NATURE COMMUNICATIONS
卷 13, 期 1, 页码 -出版社
NATURE PORTFOLIO
DOI: 10.1038/s41467-022-34389-0
关键词
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资金
- National Research, Development and Innovation Office of Hungary [K131938]
- Young Scholar Fund at the University of Konstanz
- Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) [328545488-TRR 227, PID2021-122980OB-C55, RYC-2020-030605-I, MCIN/AEI/10.13039/501100011033]
- ESF Investing in your future - University of Edinburgh
- EPSRC [EP/P020267/1]
- ARCHER UK National Supercomputing Service [d429]
- Spanish Ministry of Science's grant program Europa-Excelencia [EUR2020-112238]
- EPSRC Early Career Fellowship [EP/T021578/1]
- University of Edinburgh
- Ministry of Education, Singapore, under its Research Centre of Excellence award
- Institute for Functional Intelligent Materials [EDUNC-33-18-279-V12]
- Royal Society (UK) [RSRP\R\190000]
This study demonstrates that magnetic ordering can be stabilized at finite temperatures in finite-size 2D van der Waals magnets with short-range interactions, independent of magnetic anisotropy and lattice symmetry.
The Mermin-Wagner theorem states that long-range magnetic order does not exist in one- (1D) or two-dimensional (2D) isotropic magnets with short-ranged interactions. Here we show that in finite-size 2D van der Waals magnets typically found in lab setups (within millimetres), short-range interactions can be large enough to allow the stabilisation of magnetic order at finite temperatures without any magnetic anisotropy. We demonstrate that magnetic ordering can be created in 2D flakes independent of the lattice symmetry due to the intrinsic nature of the spin exchange interactions and finite-size effects. Surprisingly we find that the crossover temperature, where the intrinsic magnetisation changes from superparamagnetic to a completely disordered paramagnetic regime, is weakly dependent on the system length, requiring giant sizes (e.g., of the order of the observable universe - 10(26) m) to observe the vanishing of the magnetic order as expected from the Mermin-Wagner theorem. Our findings indicate exchange interactions as the main ingredient for 2D magnetism.
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