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Title: Magnetic interactions and spin excitations in van der Waals ferromagnet VI3

Journal Article · · Journal of Physics. D, Applied Physics

Using a combination of density functional theory (DFT) and spin-wave theory methods, we investigate the magnetic interactions and spin excitations in semiconducting VI3. Exchange parameters of monolayer, bilayer, and bulk forms are evaluated by mapping the magnetic energies of various spin configurations, calculated using DFT + U, onto the Heisenberg model. The intralayer couplings remain largely unchanged in three forms of VI3, while the interlayer couplings show stronger dependence on the dimensionality of the materials. We calculate the spin-wave spectra within a linear spin-wave theory and discuss how various exchange parameters affect the magnon bands. Here, the magnon–magnon interaction is further incorporated, and the Curie temperature is estimated using a self-consistently renormalized spin-wave theory. To understand the roles of constituent atoms on magnetocrystalline anisotropy energy (MAE), we resolve MAE into sublattices and find that a strong negative V-I inter-sublattice contribution is responsible for the relatively small easy-axis MAE in VI3.

Research Organization:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Organization:
National Natural Science Foundation of China; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division
Grant/Contract Number:
AC02-05CH11231; AC02-07CH11358
OSTI ID:
1819751
Report Number(s):
IS--J-10,599
Journal Information:
Journal of Physics. D, Applied Physics, Journal Name: Journal of Physics. D, Applied Physics Journal Issue: 46 Vol. 54; ISSN 0022-3727
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English

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