What is the fine-grained topic of the following text: Taking advantage of magnetic contrast and element specificity of x-ray spectroscopy we showed that in a Ni81Fe19/Cu/Cu75Mn25/Cu/Co multilayer, spin current excited in the Ni81Fe19 layer propagates across the Cu spacer layer and excites a precession in the Co layer. Only return the topic.
Spin current propagation in a Ni81Fe19/Cu/Cu75Mn25/Cu/Co multilayer