Abstract
We report on spin-dependent phase shift of the electron wave reflected at the film/vacuum and film/substrate interfaces for electrons with energies above the vacuum level. The phase shift is determined within the Fabry-P\'erot interferometer model of an absorbing medium, which takes into account the band structure of film and substrate. The results obtained for the model system Fe/W(110) indicate that the phase shift has nonzero values in the entire investigated energy range (up to 20 eV), including the energies of the allowed states in the substrate. This is in contrast to the available models which give zero phase shift for those energy ranges. It is also shown that the spin dependence is much stronger for the Fe/vacuum than for the Fe/W interface.
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