▎ 摘　　要

We investigate spin transport in graphene with a particular profile of magnetic vector potential, the double magnetic barrier structure. The results are characterized by sharp resonant tunneling peaks in the transmission. These peaks could be spin-split under certain conditions, resulting in considerable spin-polarization in the conductance. By applying electrostatic modulation, in addition to the double barrier structures, we could change the sign of the spin polarization and observe tunable spin transport.