Coverage-dependent magnetic and electronic properties of graphene with Co adatoms

Decorating two-dimensional (2D) materials with transition-metal adatoms is an effective way to bring about new physical properties that are intriguing for applications in electronics and spintronics devices. Here, we systematically studied the coverage-dependent magnetic electronic of graphene decorated by Co adatoms, based on first-principles calculations. We found if coverage larger than 1/3[Formula: see text]ML, atoms will aggregate form a monolayer then van der Waals bilayer system between forms. When [Formula: text][Formula: adatom spin-polarized spin moment varying from 1.1 1.4[Formula: text]. The text] orbitals hybridize significantly bands graphene, which generates series energy range text]eV 1[Formula: respect Dirac point graphene. In most cases, near Fermi level lead topological states characterized quantum anomalous Hall effect.