Perfect spin filtering effect and spin negative differential resistance in TM@C6N7 monolayer with graphene nanoribbon electrodes

Based on the successful synthesis of the C ₆N ₇ monolayer recently, we build a series of device models with transition metal containing Fe, Mn, Co,Ni-embedded C ₆N ₇ structures (X@C ₆N _7, X = Fe, Mn _, Co _, and Ni) as the central scattering region and graphene nanoribbon as the electrodes and investigate their spin transport properties using density functional theory combined with non-equilibrium Green’s function. The calculated results demonstrate that all the models exhibit remarkable spin filtering efficiency (over 85 %). Moreover, the Fe@C ₆N ₇ model shows significant spin negative differential resistance. The mechanisms for these phenomena have been further analyzed. These findings provide a candidate platform for the design of multifunctional spintronic devices.