Speaker: 栗佳 (北京大学)

Time: September 29, 2016 10:00

Place: 理科楼三楼报告厅（C302）

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.

Reference：

J. Li et al., Phys. Rev. Lett. 117, 076602 (2016)