Dresden 2017 – scientific programme
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O: Fachverband Oberflächenphysik
O 12: Organic-Inorganic Hybrid Systems and Organic Films II
O 12.3: Talk
Monday, March 20, 2017, 15:30–15:45, WIL A317
Spin-dependent dispersion of the hybrid band structure of the Alq3/Co interface — •Johannes Stöckl1, Anatol Jurenkow1, Nicolas Großmann1, Benjamin Stadmüller1, Mirko Cinchetti2, and Martin Aeschlimann1 — 11 Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, Erwin-Schrödinger-Straße 46, 67663 Kaiserslautern, Germany — 2Experimentelle Physik VI, Technische Universität Dortmund, 44221 Dortmund, Germany
Extensive studies in the last decade revealed that the spin polarization of ferromagnetic surfaces can be strongly altered by the adsorption of organic molecules. This effect is usually attributed to the formation of hybrid interface states across the metal-organic interface. Here we use spin- and angle-resolved photoemission (SR-ARPES) performed with VUV radiation to reveal changes in the spin dependent surface band structure of a thin cobalt film upon adsorption of the prototypical molecule Alq3. For the bare Co(100) surface, we find clearly dispersing d-bands along Γ-X in the vicinity of the Fermi energy, leading to an overall negative spin polarization at EF. The dispersion of the d-bands, and hence the corresponding spin polarization, change upon adsorption of Alq3. In particular, the effective mass of the Co d-bands increases significantly for both majority- and minority bands leading to an almost flat band dispersion and a uniform spin polarization for electron momenta at the Alq3/Co interface. Our findings will be discussed in the framework of a final state diffraction effect at the metal-organic interface and the formation of hybrid interface states.