Magnetic and electric properties of single crystal MnI₂

Multiferroic materials endowed with both dielectric and magnetic orders, are ideal candidates for a wide range of applications. In this work, we reported two phase transitions of MnI₂ at 3.45 K and 4 K by systemically measuring the magnetic-field and temperature-dependent magnetization of the MnI₂ thin flakes. Furthermore, we observed similar temperature and field-dependent behaviours for the magnetic susceptibility of MnI₂ and electronic capacitance of the Ag/MnI₂/Ag devices below 3.5 K. Considering the related theory work, we discussed the relationship between the antiferromagnetic and ferroelectric orders in MnI₂. Our work reveals the in-plane magnetic and electric properties of MnI₂ materials, which might be helpful for the further investigation and application of MnI₂ multiferroics in the future.