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We compute the spin current rectification coefficient of a non-equilibriumquantum dot subject to a spin bias and an {\it ac} charge bias with smallamplitude. As a function of the position of the resonant level the spin currentrectification coefficient shows a set of three peaks around the gate voltage atwhich the resonant or the upper level of the dot is in the vicinity of theequilibrium Fermi level in the leads. The peak heights can be related to theaverage number of the quantum dot electrons. We discuss the frequencydependence of the spin current rectification coefficient as well and emphasizethe effects of the photon-assisted spin transport through the dot.

Spin current rectification from a spin-biased quantum dot