In sandwiches of FeK and FeCs the conduction electrons in the alkali metals have a large mean free path. The experiments suggest that the specular reflection for spin up and down electrons is different at the interface yielding a spin current in the alkali film. The spin current is detected by the anomalous Hall effect of Pb surface impurities.
@article{arxiv.cond-mat/0403024,
title = {Induced Spin-Currents in Alkali-Films},
author = {Gerd Bergmann and Funing Song and Doug Garrett},
journal= {arXiv preprint arXiv:cond-mat/0403024},
year = {2009}
}