Journal
NPJ COMPUTATIONAL MATERIALS
Volume 8, Issue 1, Pages -Publisher
NATURE PORTFOLIO
DOI: 10.1038/s41524-022-00904-6
Keywords
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Funding
- National Natural Science Foundation of China [12004137, 11974145]
- Key Research and Development Program of Shandong Province [2019JZZY010313]
- Natural Science Foundation of Shandong Province [ZR2020QA052, ZR2020ZD28]
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Electrically controlled half-metallicity can be achieved and controlled in antiferromagnets by constructing van der Waals heterostructures, providing a promising candidate for designing advanced nanodevices.
Electrically controlled half-metallicity in antiferromagnets is of great significance for both fundamental research and practical application. Here, by constructing van der Waals heterostructures composed of two-dimensional (2D) A-type antiferromagnetic NiI2 bilayer (bi-NiI2) and ferroelectric In2Se3 with different thickness, we propose that the half-metallicity is realizable and switchable in the bi-NiI2 proximate to In2Se3 bilayer (bi-In2Se3). The polarization flipping of the bi-In2Se3 successfully drives transition between half-metal and semiconductor for the bi-NiI2. This intriguing phenomenon is attributed to the joint effect of polarization field-induced energy band shift and interfacial charge transfer. Besides, the easy magnetization axis of the bi-NiI2 is also dependent on the polarization direction of the bi-In2Se3. The half-metallicity and magnetic anisotropy energy of the bi-NiI2 in heterostructure can be effectively manipulated by strain. These findings provide not only a feasible strategy to achieve and control half-metallicity in 2D antiferromagnets, but also a promising candidate to design advanced nanodevices.
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