Prediction of High Curie Temperature, Large Magnetic Crystal Anisotropy in 2D Ferromagnetic Co2Ge2Te6 Monolayer and Multilayer
Abstract
The Co2Ge2Te6 shows intrinsic ferromagnetic (FM) order, which origins from superexchange interaction between Co and Te atoms, with higher Curie temperature (Tc) of 161 K. Co2Ge2Te6 monolayer (ML) is half-metal (HM), and spin-β electron is a semiconductor with gap of 1.311 eV. Co2Ge2Te6 ML tends in-plane anisotropy (IPA), with magnetic anisotropy energy (MAE) of -10.2 meV/f.u.. Co2Ge2Te6 ML shows good dynamical and thermal stability. Most interestingly, bilayers present ferromagnetic half-metallicity independent of the stacking orders. Notley, the multilayers (N 6) present ferromagnetic HM, while the magnetoelectronic properties are related with the stacking patterns in thinner multilayers. Moreover, the magnetoelectronic properties are dependent on the stacking orders of bulk. The magnetic order with multilayers is determined by the super-super exchange and weak van der Waals (vdW) interaction. Co2Ge2Te6 with intrinsic ferromagnetism, good stability of ferromagnetism and half-metallicity could help researchers to investigate its wide application in the spintronics.
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