题 目: Direct detection of pure AC spin-current by x-ray pump-probe measurements
主讲人: 栗佳(研究员)
主持人: 金立川(副教授)
简 介:
栗佳,青年千人,北京大学物理学院、量子材料科学中心研究员,复旦大学物理系博士,加州大学伯克利分校物理系博士后。主要从事磁性超薄膜和磁性纳米结构的各类磁学性质研究,包括:人工磁性纳米结构的拓扑磁性和拓扑操控,拓扑结构的人为操控和输运质研究,磁性氧化物薄膜的磁结构及自旋阻挫,磁性材料的超快磁性研究及微波频率下的自旋流物理性质研究。研究成果在Nature Communications, Physical Review Letters, Physical Review B, Applied Physics Letters等国际著名期刊上发表30余篇。
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.
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