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3月8日 北京大学量子材料科学中心栗佳研究员学术报告:Direct detection of pure AC spin-current by x-ray pump-probe measurements


报告题目:Direct detection of pure AC spin-current by x-ray pump-probe measurements    
报告人:栗佳研究员
             北京大学量子材料科学中心, 
时间:2017年03月08日 上午 10:00
地点:唐仲英楼 A213
 
报告简介:
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 Cu 75 Mn 25  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.


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