Abstract

We observe an enhanced spin-polarization and a reduction of surface sensitivity due to intermediate unoccupied electronic states in spin-resolved two-photon photoemission (2PPE) from ferromagnetic cobalt films. We discriminate 2PPE signals coming from initial and intermediate electronic states. This allows us to determine the influence of unoccupied quantum-well states in the two-photon transitions.KeywordsSurface SensitivityUnoccupied State2PPE SignalExcitation PathwayExcite QuantumThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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