Dresden 2011 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 63: [MA] Surface magnetism III
O 63.6: Vortrag
Donnerstag, 17. März 2011, 12:15–12:30, HSZ 103
Spinresolved UPS: Study of the O p(1x1) phase on Fe(100) Using a Novel Multichannel Spinpolarimeter — •Michaela Hahn, Bernd Petereit, Martin Jourdan, Hans-Joachim Elmers, and Gerd Schönhense — Institut für Physik, Staudinger Weg 7, 55128 Mainz
A novel type of multichannel spindetector has been implemented recently, with strongly improved efficiency as compared to modern state-of-the-art single channel spin analysers. By the usage of parallel multichannel detection, it is possible to reduce the measuring time by orders of magnitude [1]. The sample systems Fe/MgO and O/Fe/MgO have been studied as a first application exploiting the detector’s efficiency. Epitaxial iron layers were evaporated onto MgO(100) single crystals, oxygen was dosed in small steps.
The O p(1x1) phase on Fe(100) is of particular interest, as for example described in [2]. It is formed at a dosage of 6L oxygen on the clean Fe(100) surface. Due to additional FeO-bands in the surface layer, the spin asymmetry close to the Fermi edge is expected to exhibit new features as compared to clean iron. Our spectra show a strong quenching of the minority peak very close to EF with increasing oxygen dosage. Furthermore, new features occur in the majority bandstructure.
Funded by Stiftung Rheinland-Pfalz für Innovation (project 886) and DFG (Scho 341/9-1)
[1] M. Hahn et al., this conference
[2] A. Tange et al., Phys. Rev. B 81, 195410 (2010)