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It is of great interest to explore intrinsic two-dimensional ferromagnetismand seek better two-dimensional quantum anomalous Hall insulator materials.Here, we show that the FeBr$_3$ monolayer is an intrinsic two-dimensionalferromagnetic material whose Curie temperature is 140 K thanks to its strongspin exchange interaction and giant uniaxial magnetic anisotropy. Our phononspectra and mechanical analysis indicate that the FeBr$_3$ monolayer isdynamically and mechanically stable. Our electronic structure calculation showsthat there is one Dirac cone at K point in the Brillouin zone and thespin-orbit coupling opens a semiconductor gap of 33.5 meV. Furthertight-binding analysis reveals that the Chern number is equivalent to 1 andthere is a quantum anomalous Hall conductivity $\sigma _{xy} = e^2/h$, and thechiral edge states are fully spin-polarized when an edge is created.Furthermore, it is shown that the main results are not affected by electroncorrelation effects and biaxial strain. Therefore, this FeBr$_3$ monolayer as2D material would be useful for spintronic applications.

Intrinsic 2D ferromagnetism, quantum anomalous Hall conductivity, and fully-spin-polarized edge states of FeBr3 monolayer