Dresden 2009 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 27: Poster Session I (Methods: Scanning probe techniques; Methods: Atomic and electronic structure; Methods: Molecular simulations and statistical mechanics; Oxides and Insulators: Clean surfaces; Oxides and Insulators: Adsorption; Oxides and Insulators: Epitaxy and growth; Semiconductor substrates: Clean surfaces; Semiconductor substrates: Epitaxy and growth; Semiconductor substrates: Adsorption; Nano- optics of metallic and semiconducting nanostructures; Electronic structure; Methods: Electronic structure theory; Methods: other (experimental); Methods: other (theory); Solutions on surfaces; Epitaxial Graphene; Surface oder interface magnetism; Phase transitions; Time-resolved spectroscopies)
O 27.106: Poster
Dienstag, 24. März 2009, 18:30–21:00, P2
Spin dependent surface barrier resonance studied by spin-polarized electron energy loss spectroscopy — Yu Zhang1, Jacek Prokop1, Ioan Tudosa1, Wen Xin Tang1, •Thiago R. F. Peixoto1,2, Khalil Zakeri1, and Jürgen Kirschner1 — 1Max-Planck Institut für Mikrostrukturphysik,Weinberg 2, 06120 Halle — 2Instituto de Física, Universidade de São Paulo, São Paulo, Brazil
It has been shown that the surface barrier resonance can be detected by electron energy loss spectroscopy [1]. In this work, we use the spin-polarized electron energy loss spectroscopy (SPEELS) to investigate the spin dependence of the surface barrier resonance in the oxygen passivated Fe films grown on W(001). The peaks induced by the surface barrier resonance were observed when measuring the intensity of the specularly reflected electrons as a function of the primary energy from 3 to 40 eV. Depending on the spin polarization and the incident angle, the peaks showed different intensities and energies. Large spin asymmetries, up to 80%, were found at about 4 eV. The peaks due to the surface barrier resonance can be also clearly observed in the energy loss spectra measured in the off-specular geometry. The dispersion of the surface barrier resonances obtained from both the peak energies and the momentum transfer clearly shows the spin dependence.