To obtain high-performance spintronic devices with high integration density,two-dimensional (2D) half-metallic materials are eagerly pursued all along.Here, we propose a stable 2D material with a honeycomb-kagome lattice, i.e.,the Mg3C2 monolayer, based on first-principles calculations. This monolayer isan anti-ferromagnetic (AFM) semiconductor at its ground state. We furtherdemonstrate that a transition from AFM semiconductor to ferromagnetichalf-metal in this 2D material can be induced by carrier (electron or hole)doping. This magnetic transition can be understood by the Stoner criterion. Inaddition, the half-metallicity arises from the 2pz orbitals of the carbon (C)atoms for the electron-doped system, but from the C 2px and 2py orbitals forthe case of hole doping. Our findings highlight a new promising material withcontrollable magnetic and electronic properties toward 2D spintronicapplications.
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