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O: Fachverband Oberflächenphysik
O 36: Poster Session II (Organic films and electronics, photoorganics; Nanostructures; Plasmonics and nanooptics, Surface chemical reactions and heterogeneous catalysis, Surface dynamics )
O 36.81: Poster
Dienstag, 12. März 2013, 18:15–21:45, Poster B2
Highly efficient spin-resolved photoelectron spectroscopy experiment — •Moritz Plötzing, Roman Adam, Lukasz Plucinski, and Claus M. Schneider — Peter Grünberg Institut (PGI-6), Research Center Jülich, 52425 Jülich, Germany
The presented work aims for building up an energy- and spin-filtered photoemission setup enabling electron count rates high enough for pump-probe experiments using pulsed extreme ultraviolet light sources. In order to reach the needed efficiency, the experiment is equipped with a high-transmission spectrometer as well as a spin-detector based on photoelectron scattering from a thin, oxidized iron film. The latter has a figure of merit FOM=S2 I/I0 (1) of 2.2 × 10−3 for a measurement of both orthogonal spin directions beeing more than one order of magnitude higher compared to other commercially available spin-detectors [1]. First results using a He discharge lamp on thin Co films in-situ grown on Cu(100) verify the high scattering efficiency I/I0 ≈ 10% in spin-resolved operation mode. Additionally, the determined spin-polarization P ≈ 30% in the electrons below valence band is comparable with other published data and hence confirms the expected Sherman function, too. Both together serves as a proof of the high FOM.
(1): S: Sherman function, I/I0: spin-resolved count rate normalized to count rate for incoming electrons
[1] M. Escher et al., FERRUM: A New Highly Efficient Spin Detector for Electron Spectroscopy, e-J. Surf. Sci. Nanotech. Vol. 9 (2011)