Dresden 2014 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 37: Posters: Plasmonics, Electronic Structure and Spin-Orbit Interaction, Semiconductor and Insulator Surfaces, Nanostructures
O 37.56: Poster
Dienstag, 1. April 2014, 18:30–22:00, P2
Specular reflection of spin-polarized electrons from W(001) spin-filter crystal in a larger range of scattering energies and angles — •D. Kutnyakhov1, H.J. Elmers1, G. Schönhense1, C. Tusche2, J. Kirschner2, S. Borek3, J. Braun3, J. Minàr3, and H. Ebert3 — 1Institut für Physik, Johannes Gutenberg-Universität Mainz — 2MPI für Mikrostrukturphysik, Halle — 3Department Chemie, Physikalische Chemie, Universität München
Extending our previous work on the novel imaging spin-filter technique based on electron diffraction from W(001) in the specular (00)-LEED spot [1,2], we studied the scattering energy (E) and angle of incidence (theta)-landscape of the spin sensitivity S, and reflectivity I/I0. The setup includes a spin-polarized GaAs electron source and a rotatable delayline detector for spatially-resolving detection. We measured the intensity and spin asymmetry of the specularly reflected beam for a large range of energies and angles of incidence of spin-polarized primary electrons. Resulting energy-angular landscape show rather good agreement with theory (relativistic layer KKR SPLEED code [3,4]). The results identify several regions of high asymmetry and figure of merit. These regions open a path for the development of the multichannel spin-filter for electron spectroscopy and momentum microscopy with higher performance. Funded by BMBF (05K13UM1).
[1] C. Tusche et al., APL 99 (2011) 032505; [2] M. Kolbe et al., PRL 107 (2011) 207601; [3] R. Feder in Polarized Electrons in Surface Physics (World Scientific, Singapore, 1985); [4] H. Ebert et al., Rep. Prog. Phys. 74, 096501 (2011)