▎ 摘　　要

We use spin density functional theory ab initio calculations to theoretically explore the possibility of achieving useful gate control over exchange coupling between cobalt clusters placed on a graphene sheet. By applying an electric field across supercells, we demonstrate that the exchange interaction is strongly dependent on gate voltage, and find that it is also sensitive to the relative sublattice registration of the cobalt clusters. We use our results to discuss strategies for achieving strong and reproducible magnetoelectric effects in graphene/transition-metal hybrid systems. DOI: 10.1103/PhysRevB.87.144410