We theoretically investigate nonadiabatic quantum spin pumping in zigzag/bearded graphene nanoribbons, in which two bearded graphene nanoribbon regions are deposited by local ferromagnetic insulators to induce spin splitting. We show that spin-polarized currents, spin separation, and even pure spin pumping can be achieved by tuning the driving frequency and the magnetization orientations of the two ferromagnetic insulators. Meanwhile, for the two ferromagnetic insulators with antiparallel/parallel magnetization orientation, the left and right electrodes can simultaneously generate an equal amount of pumped currents with opposite/same spin polarization. Moreover, in the two-parameter spin pumping regime, the flowing directions of the pumped currents can be tuned by the phase difference. This suggests a useful method for manipulating and separating spin in graphene nanoribbons, which is important for spintronic applications.
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