Jiang J, Li R, Mi W. Exchange interactions in the 1T-VSe
2 monolayer and their modulation
via electron doping using alkali metal adsorption and the electride substrate.
MATERIALS HORIZONS 2022;
9:2785-2796. [PMID:
36040428 DOI:
10.1039/d2mh00888b]
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Abstract
The modulation of exchange interactions in layered magnets has fundamental research value and potential applications in spintronics. Based on first-principles calculations, the exchange interactions in the experimentally controversial room-temperature ferromagnetic 1T-VSe2 monolayer are systematically studied. It is found that three shells of nearest-neighbor Heisenberg exchange interactions and higher-order interactions are crucial for an accurate description of the magnetism and its thermal stability in the 1T-VSe2 monolayer. Based on our understanding of tuning the magnetic interactions and the magnetic ground state in the 1T-VSe2 monolayer via external factors, two modulation methods, involving adsorption of the alkali metal lithium and the electride Ca2N substrate, are proposed. In both Li-VSe2 and VSe2/Ca2N systems, the strongly frustrated Heisenberg exchange interaction competes with the Dzyaloshinskii-Moriya interaction and magnetocrystalline anisotropy, leading to complex magnetic ground states, such as antiferromagnetic spin spiral and periodic antiferromagnetic cycloidal states. Moreover, the higher-order exchange interactions play a crucial role in the stabilization of long-range double-row-wise antiferromagnetic states in Li-VSe2 and VSe2/Ca2N. These results highlight the effective manipulation of exchange interactions in two-dimensional magnets.
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