Electrostatic tuning of magnetism in CrI3 monolayer via charge doping within a single electron transistor environment

Two-dimensional (2D) intrinsic ferromagnetic materials have garnered great interest in recent years due to their potential application in nanoelectronics and spintronics. However, the low Curie temperature is a major bottleneck for spintronic applications. Here, using first-principles-based calculations, we study the magnetic behavior of a two-dimensional CrI3 monolayer in a single-electron transistor (SET) environment, revealing the impact of charge doping and electric fields on the material. In the SET device, the CrI3 monolayer exhibits a spin-polarized half-metallic state, which is preserved under charge doping and the application of electric fields. Our computational analysis reveals that charge doping significantly strengthens ferromagnetism in the CrI3 monolayer. Subsequently, the coupling of charge doping with electric fields increases the ferromagnetic ordering and enhances the Curie temperature to 116 K, which is approximately ∼142% higher than the pristine value. This work established novel effective way to enhance the Curie temperature of CrI3 monolayer and significantly advances its potential for future spintronic device applications.