Berlin 2012 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 72: [MA] Joint Session "Surface Magnetism III" (jointly with O)
O 72.15: Vortrag
Donnerstag, 29. März 2012, 19:00–19:15, BH 243
Extending the two-dimensional electron spin-filter to a larger range of scattering energies and angles — •D. Kutnyakhov1, K. Medjanik1, S.A. Nepijko1, H.J. Elmers1, G. Schönhense1, C. Tusche2, J. Kirschner2, F. Giebels3, H. Gollisch3, and R. Feder3 — 1Inst. f. Physik, Univ. Mainz — 2MPI f. Mikrostrukturphysik, Halle — 3Theor. Festkörperphysik, Univ. Duisburg-Essen
In continuation of recent 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 delayline detector for spatially-resolving detection. Intensities, spin-orbit-induced asymmetries and figures of merit have been calculated by means of a relativistic layer KKR SPLEED code [3]. We assumed a 6 % inward relaxation of the topmost layer. The quasi-particle potential input for the SPLEED calculations was obtained by computing the ab-initio ground state electronic structure (FLAPW) and secondly augmenting the resulting potential by a complex self-energy correction. E-theta-behaviour studies open a path to an increased angular acceptance and energy range of the approach, thus increasing the performance of the multichannel spin-filter for electron spectroscopy [2].
Funded by DFG (Scho341/9 and TR 49), graduate school MAINZ.
[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, ed. by R. Feder (World Scientific, Singapore, 1985).