▎ 摘　　要

The idea of spin injection into graphene by proximity effect is an interesting and timely topic. Furthermore, using 2D materials to induce such an effect instead of bulk materials is a recent targeted route towards better solution for 2D spintronics. We report on first-principle calculations of the spin-dependent properties in graphene induced by its interaction with a nearby half-metallic Cr2C (2D MXene). Spin polarization can be induced in graphene by the interfacial proximity of half-metallic Cr2C ferromagnet. The average spin polarization in the graphene can reach to 74%, which is much larger than the graphene/magnetic metal or graphene/magnetic insulator heterostructures. The observed spin splitting comes from the interaction between C-pz and Cr-3d states. Except for a n-doped feature by charge transfer, the linear dispersion of Dirac cone is modified with a band gap opening of 80 meV between the bonding and antibonding states. Especially, the electronic structure, charge transfer and gap opening are shown to depend strongly on the graphene/Cr2C interlayer, which can be tailored by strain. Moreover, a strain modulated spin filter based on the graphene/Cr2C heterostructure has been proposed. These results strongly revive this novel system as a candidate for future graphene-based spintronic devices. (C) 2018 Elsevier Ltd. All rights reserved.