Direct detection of pure AC spin-current by x-ray pump-probe measurements
Speaker: 栗佳 (北京大学)
Time: September 29, 2016 10:00
摘要：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. This element-resolved pump-probe measurement unambiguously identifies the AC spin current in the Cu75Mn25 layer.
J. Li et al., Phys. Rev. Lett. 117, 076602 (2016)