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VIDEO DOI: https://doi.org/10.48448/550c-n831

technical paper

MMM 2022

November 07, 2022

Minneapolis, United States

Tuning exchange interactions in 1T VSe2 monolayer by alkali metal adsorption and electride substrate

The manipulation of exchange interactions in two-dimensional magnets has fundamental research value and potential applications. Based on first-principles calculations, the exchange interactions in experimental controversial ferromagnetic 1T-VSe2 monolayer 1,2 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 ferromagnetism in 1T-VSe2 monolayer. Based on the understanding of tuning the magnetic interactions and the magnetic ground state in 1T-VSe2 monolayer by external factors, two modulation methods, alkali metal Lithium adsorption and electride Ca2N substrate, are proposed. In both systems, the strongly frustrated Heisenberg exchange interactions compete with higher-order exchange interactions, Dzyaloshinskii-Moriya interaction and magnetocrystalline anisotropy, leading to complex magnetic ground states, such as antiferromagnetic spin spiral, periodical antiferromagnetic cycloidal state and double row-wise antiferromagnetic states. These results highlight the effective manipulation of exchange interactions in two-dimensional magnets.
This work was supported by the National Natural Science Foundation of China (51871161 and 52071233). References
1 M. Bonilla, S. Kolekar, Y. Ma, et al. Nat. Nanotechnol. 13, 289 (2018).
2 P. K. J. Wong, W. Zhang, F. Bussolotti, et al. Adv. Mater. 31, 1901185 (2019).


Transcript English (automatic)

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