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Despite recent progress in spin-current research,the detection of spin current has mostly remained indirect.By synchronizing a microwave waveform with synchrotron x-ray pulses,we use the ferromagnetic resonance of the Py(Ni81Fe19)layer in a Py/Cu/Cu75Mn25/Cu/Co multilayer to pump a pure AC spin current into the Cu75Mn25 and Co layers,and then directly probe the spin current within the Cu75Mn25 layer and the spin dynamics of the Co layer by x-ray magnetic circular dichroism.