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.
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References
C.-T. Chiang, A. Winkelmann, P. Yu, and J. Kirschner, “Magnetic Dichroism from Optically Excited Quantum Well States” Phys. Rev. Lett. 103, 077601 (2009)
C.-T. Chiang, A. Winkelmann, J. Henk, F. Bisio, J. Kirschner, “Spin-selective pathways in linear and nonlinear photoemission from ferromagnets” Phys. Rev. B 85, 165137 (2012)
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Winkelmann, A., Chiang, CT., Pazgan, M., Peixoto, T.R.F., Kirschner, J. (2015). Spin-selective excitation pathways in nonlinear photoemission from metal surfaces. In: Bigot, JY., Hübner, W., Rasing, T., Chantrell, R. (eds) Ultrafast Magnetism I. Springer Proceedings in Physics, vol 159. Springer, Cham. https://doi.org/10.1007/978-3-319-07743-7_88
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DOI: https://doi.org/10.1007/978-3-319-07743-7_88
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