Induced Spin-Currents in Alkali-Films
  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. 
Gerd Bergmann, Funing Song and Doug Garrett