Journal
APPLIED SURFACE SCIENCE
Volume 572, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2021.151478
Keywords
Two-dimensional materials; van der Waals heterostructures; First-principles calculations; Curie temperature; PtBr3
Categories
Funding
- National Natural Science Foundation of China [11804075, 11874013]
- Natural Science Foundation of Hebei Province [A2019202015]
- Foundation for the Top Talents in Universities in Hebei Province [SLRC2019024]
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By utilizing PtBr3/WSe2 van der Waals heterostructures, the PtBr3 monolayer demonstrates high ferromagnetic order and can achieve a high Curie temperature, showing promise for significant impact in spintronic devices.
Two-dimensional ferromagnetic semiconductors hold great promise for next-generation spintronic applications. However, candidates with high Curie temperature (T-c) are still lacking. Using the first-principles calculations, the PtBr3 monolayer is found to exhibit ferromagnetic order above the room temperature. The formation of PtBr3/WSe2 van der Waals heterostructures can increase the T-c to similar to 410 K by additional super-exchange path of Pt-Se-Pt. The spin-exchange interactions for this path is as strong as similar to 22 meV, which is superior to most other magnetic system. The out-of-plane compression further boosts the T-c to similar to 636 K. The interlayer magnetic coupling is highly tunable depending on the stacking alignment, which closes or weakens some super-exchange channels. In addition, the interlayer interaction leads to a phase transition from half-metal to semiconductor, which greatly promotes its potential in spintronic applications. The strong stacking dependent feature is feasible to manipulate the magnetic orders by external strain or mechanical motion.
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