  The anomalous Hall effect of Fe(CsAu) is investigated. Electrons with spin up
and down experience a different degree of specular reflection at the FeCs
interface. This yields a different mean free path for the two spin
orientations. In the presence of an electric field parallel to the film plane
one obtains a spin current in addition to the charge current. If one introduces
impurities with a large spin-orbit scattering into the Cs host then the
combination of spin current and spin-orbit scattering yields an anomalous Hall
effect. By building in situ multi layers of CsAu (5nm of Cs and 0.04 atomic
layers of Au) on top of an Fe film one can measure the relative magnitude of
the spin current normal to the film. Within the accuracy of the experimental
data the spin current in Fe(CsAu) decays exponentially with a decay length of
20nm. PACS: 73.50.-h, 72.25.Ba, 73.40.Jn, 73.21.Cd
