Quantum spin and charge pumping through double quantum dots with ferromagnetic leads

► We theoretically investigate the pumping of electrons through double quantum dots attached to ferromagnetic leads. ► An oscillating electric field applied to the quantum dot may give rise to the pumped charge and spin currents. ► When both leads are ferromagnet, a pure spin current can be generated in the antiparallel magnetization configuration. ► By making use of various tunings, the magnitude and direction of the pumped spin current can be well controlled. ► When only one lead is ferromagnetic, both of the charge and spin currents can be pumped and flow in opposite directions.