Ising ferromagnetism and robust half-metallicity in two-dimensional honeycomb-kagome Cr2O3 layer
Arqum Hashmi, Kenta Nakanishi, M. Umar Farooq, Tomoya Ono
Abstract
Abstract In contrast to the current research on two-dimensional (2D) materials, which is mainly focused on graphene and transition metal dichalcogenide-like structures, studies on 2D transition metal oxides are rare. By using ab initio calculations along with Monte Carlo simulations and nonequilibrium Green’s function method, we demonstrate that the transition metal oxide monolayer (ML) of Cr 2 O 3 is an ideal candidate for next-generation spintronics applications. 2D Cr 2 O 3 has honeycomb-kagome lattice, where the Dirac and strongly correlated fermions coexist around the Fermi level. Furthermore, the spin exchange coupling constant shows strong ferromagnetic (FM) interaction between Cr atoms. Cr 2 O 3 ML has a robust half-metallic behavior with a large spin gap of ~3.9 eV and adequate Curie temperature. Interestingly, an intrinsic Ising FM characteristic is observed with a giant perpendicular magnetocrystalline anisotropy energy of ~0.9 meV. Most remarkably, nonequilibrium Green’s function calculations reveal that the Cr 2 O 3 ML exhibits an excellent spin filtering effect.