Monolayer NiBr2 has a cycloidal spin order with polarization from the gKNB mechanism, while monolayer NiI2 needs an additional p-d hybridization term proportional to sin(4πq) to explain its polarization.
Kurumaji, Spiral spin structures and skyrmionsin mul- tiferroics, Physical Sciences Reviews5, 10.1515/psr-2019- 0016 (2020)
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Microscopic origin of magnetoferroelectricity in monolayer NiBr$_{2}$ and NiI$_{2}$
Monolayer NiBr2 has a cycloidal spin order with polarization from the gKNB mechanism, while monolayer NiI2 needs an additional p-d hybridization term proportional to sin(4πq) to explain its polarization.