▎ 摘　　要

It has been shown recently that the magnetic state of single-atom vacancy in graphene can be manipulated reversibly by mechanical deformation. Here, we investigate the possibility to flip the spin current of a model graphene device using nanomechanical distortion. Extensive first-principles calculations show that spin polarized currents can be altered by applying a shear distortion. The magnetic transitions in the central device, which is associated with the reversal of spin polarization of the pi band of the vacancy state, lead to current flip with a spin filtering efficiency up to 17% (and a maximum change by 24% upon distortion). Our result opens the possibility to control spin transport properties in graphene and has potential applications in spintronics such as spin valves and spin transistors. (C) 2018 Elsevier Ltd. All rights reserved.