Regensburg 2004 – wissenschaftliches Programm
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MA: Magnetismus
MA 4: Oberfl
ächenmagnetismus
MA 4.9: Vortrag
Montag, 8. März 2004, 12:15–12:30, H22
Spin-orbit interaction at the Gd(0001) and O/Gd(0001) surfaces — •O. Krupin1, G. Bihlmayer2, S. Gorovikov3, J. E. Prieto1, K. Döbrich1, G. Kaindl1, S. Blügel2, and K. Starke1 — 1Institut für Experimentalphysik, Freie Universität Berlin — 2Institut für Festkörperforschung (IFF), Forschungszentrum Jülich — 3MAX-Lab, Lund University, Sweden
We compare experimental angle-resolved photoemission investigations with first-principles DFT calculations, including spin-orbit interaction, of Gd(0001) and O/Gd(0001) surface states. For both systems, experimental and theoretical results reveal that the energy dispersion of the surface state depends on the relative orientation of the propagation direction of the electrons and the spin-quantisation axis. While for the clean Gd surface only the majority state of the exchange split surface states is occupied, both the minority and majority states appear below the Fermi level upon oxygen adsorption. Angle-resolved photoemission experiments on these two surface states directly demonstrate that the observed effect on the energy dispersion is caused by spin-orbit interaction. In addition, oxygen adsorption leads to a modified near-surface electronic structure that results in an increased spin-orbit interaction.