Direct Detection of Pure ac Spin Current by X-Ray Pump-Probe Measurements
Direct Detection of Pure ac Spin Current by X-Ray Pump-Probe Measurements
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DOI：
10.1103/physrevlett.117.076602
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发表时间：
2016-08-11
影响因子：
8.6
通讯作者：
Qiu, Z. Q.
中科院分区：
文献类型：
--
作者：
Li, J.;Shelford, L. R.;Qiu, Z. Q.
尽管最近在自旋流研究方面取得了进展，但对自旋流的探测大多仍然是间接的。我们利用Py/Cu/Cu75Mn25/Cu/Co多层膜中Py(Ni81Fe19)层的铁磁共振效应，通过同步X射线脉冲同步微波波形，将纯交流自旋电流注入到Cu75Mn25和Co层中，然后用X射线磁性圆二色谱直接探测Cu75Mn25层内的自旋电流和Co层的自旋动力学。这种元素分辨的泵浦-探测测量明确地识别了Cu75Mn25层中的交流自旋电流。
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.