Regensburg 2010 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 41: Poster Session I (Semiconductor Substrates: Epitaxy and growth; Semiconductor Substrates: Adsorbtion; Semiconductor Substrates: Solid-liquid interfaces; Semiconductor Substrates: Clean surfaces; Oxides and insulators: Epitaxy and growth; Oxides and insulators: Adsorption; Oxides and insulators: Clean surfaces; Organic, polymeric and biomolecular films - also with adsorbates; Organic electronics and photovoltaics, Surface chemical reactions; Heterogeneous catalysis; Phase transitions; Particles and clusters; Surface dynamics; Surface or interface magnetism; Electron and spin dynamics; Spin-Orbit Interaction at Surfaces; Electronic structure; Nanotribology; Solid/liquid interfaces; Graphene; Others)

O 41.90: Poster

Dienstag, 23. März 2010, 18:30–21:00, Poster B1

In situ real-time investigations during the formation of a magnetoelectric Fe/ZnO nanocomposite — •Erik Kröger¹, Matthias Kalläne¹, Kai Rossnagel¹, Hendrik Bentmann², Frank Forster², Friedrich Th. Reinert², and Lutz Kipp¹ — ¹Institut für Experimentelle und Angewandte Physik, Universität Kiel, 24098 Kiel, Germany — ²Experimentelle Physik II, Universität Würzburg, 97074 Würzburg, Germany

Magnetoelectric materials composed of piezoelectric and ferromagnetic substances have drawn significant interest in recent years due to their multifunctionality and potential technological applications. In order to investigate the geometric, chemical, and electronic structure of such complex materials, we have designed an experimental station for the new storage ring PETRA III in Hamburg for angle-resolved photoelectron spectroscopy. The instrument was used for in situ real-time investigations during the formation of the magnetoelectric Fe/ZnO interface. The ZnO substrate was sputtered and annealed under UHV conditions to guarantee high surface quality. LEED and EXAFS studies showed a relaxation of the hexagonal unit cell. Real-time XPS measurements were done on the polar oxygen surface of the ferroelectric ZnO compound during Fe deposition. A charge transfer from the iron adatoms to the ZnO substrate was observed and quantified. The resulting enhanced conductivity of the ZnO surface enabled very high resolution ARPES measurements of the electronic structure over the full 3D Brillouin zone. This work was supported by the BMBF.