论文部分内容阅读
Two dimensional carbon (graphene etc.) based ferromagnetic materials are fundamentally and technologically important for its application in electronics.Recent experimental studies have suggested that graphene may show ferromagnetism due to the defects.Here, we report that the V, Cr, Fe and Co doped graphyne nanoribbons (GyNRs) are ferromagnetic stable and the estimated Curie temperatures of these transition metal (TM) doped GyNRs are higher than room temperature.Furthermore, Cr, Fe and Co doped GyNRs are half-metallic with 100% electronic spin-polarization at Fermi level.Further transmission calculations show that Cr, Fe and Co doped GyNRs can act as perfect spin filters with the Cr-,Fe-and Co-3d valence-band states contributing to the coherent transport.Importantly, the high spin polarization of the current is preserved up to large bias voltages.This study provides a possible method to construct GyNR with high Curie temperature and spin-polarized electron transport properties.