Regensburg 2013 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 65: Surface and Interface Magnetism II (jointly with MA)
O 65.2: Vortrag
Donnerstag, 14. März 2013, 10:45–11:00, H33
Mapping of the spin-resolved band structure of fct cobalt films on Cu(100) — •Christian Tusche1, Martin Ellguth1, Alexander Krasyuk1, Carsten Wiemann2, Vitaliy Feyer2, Marten Patt2, Claus M. Schneider2, and Jürgen Kirschner1 — 1Max-Planck-Institut für Mikrostrukturphysik, 06120 Halle, Germany — 2Forschungszentrum Jülich, 52428 Jülich, Germany
We report on the spin resolved band structure of ultra thin fct cobalt films grown on Cu(100), measured over large volumes in momentum space. Experiments were carried out at the NanoESCA beamline [1] of the Elettra synchrotron. The instrument, consisting of a photoelectron microscope and an imaging energy analyzer, directly maps the parallel momentum component of photoelectrons at a fixed energy. An imaging spin filter, based on the reflection of low energy electrons at a W(100) crystal, was installed temporarily at the exit of the energy filter [2]. This allowed to record the spin polarization at 4·103 discrete reciprocal space points, in each momentum image. This efficient approach gives direct access to majority and minority spin bands in the Fermi surface and their dispersion towards larger binding energies. Using 40 eV to 200 eV photons, several constant energy cuts in the 3D Brillouin zone are selected. The comprehensive data sets are expected to serve as valuable input for advanced concepts in theory for the refined treatment of spin-dependent electron correlation. — [1] Wiemann, Patt, Krug, Weber, Escher, Merkel, Schneider, e-J. Surf. Sci. Nanotech. 9, 395 (2011) — [2] Tusche, Ellguth, Ünal, Chiang, Winkelmann, Krasyuk, Hahn, Schönhense, Kirschner, Appl. Phys. Lett. 99, 032505 (2011)