Direct Detection of Pure ac Spin Current by X-Ray Pump-Probe Measurements.
Li, J; Shelford, LR; Shafer, P; et al.Tan, A; Deng, JX; Keatley, PS; Hwang, C; Arenholz, E; van der Laan, G; Hicken, RJ; Qiu, ZQ
Date: 11 August 2016
Journal
Physical Review Letters
Publisher
American Physical Society
Publisher DOI
Abstract
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 (Ni_{81}Fe_{19}) layer in a Py/Cu/Cu_{75}Mn_{25}/Cu/Co multilayer to pump a pure ac spin current into the ...
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 (Ni_{81}Fe_{19}) layer in a Py/Cu/Cu_{75}Mn_{25}/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 Cu_{75}Mn_{25} 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 Cu_{75}Mn_{25} layer.
Physics and Astronomy
Faculty of Environment, Science and Economy
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