▎ 摘　　要

We theoretically presented the generation of optically induced spin photocurrents as well as an optically induced magnetoresistance (MR) in a spin-photovoltaic device based on chevron-type graphene nanoribbons, sandwiched between asymmetric ferromagnetic contacts. The designed spin photodetector showed that spin photocurrents could be generated under circularly and even linearly polarized radiations at room temperature. However, applying a circularly polarized radiation resulted in an improved sensitivity of the device to the switching of the magnetization arrangement of ferromagnetic contacts. Interestingly, the spin photovoltaic response generated a spin photocurrent ranging from terahertz to visible light with a considerable spin-dependent quantum efficiency more than 50% and a high spin polarization (92%) and an optically induced MR (3800%). The novel properties could be promising for developing graphene-based spin-photovoltaic applications such as spin filtering and helicity detection, especially in terahertz and visible regions.