Berlin 2012 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 91: [MA] Poster II
O 91.38: Poster
Freitag, 30. März 2012, 11:00–14:00, Poster A
Spin-resolved photoemission study of Bis(phthalocyaninato) terbium(III) (TbPc2) deposited on Co/Cu(001) — •Nicolas Großmann1, Sabine Steil1, Norman Haag1, Mirko Cinchetti1, Mario Ruben2, and Martin Aeschlimann1 — 1Department of Physics and Resarch Center OPTIMAS, University of Kaiserslautern, 67663 Kaiserslautern, Germany — 2Institut of Nanotechnology, Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen
We have studied the formation of the electronic structure of the interface between an epitaxially grown Co(001) thin film and the single molecular magnet Bis(phthalocyaninato)terbium(III) (TbPc2). The organic semiconductor was progressively grown on the cobalt substrate. The grown interfaces have been characterized by means of spin-resolved ultraviolet photoemission. For every growth step we have monitored the changes in the work function, the energetic position of the occupied molecular orbitals and interface states, and the changes in the cobalt spin polarization induced by interface formation. The most striking result is the presence of an occupied spin polarized hybrid interface state with a negative spin polarization, lying 0,7 eV below the Fermi level. The spin polarization of this state shows a pronounced temperature dependency. Our results agree with the recent observation of an antiferromagnetic coupling between TbPc2 and a ferromagnetic metal substrate reported in [1].
[1] Gambardella et al., Phys. Rev. Lett. 107, 177205 (2011)