A5: Growth, structure, and magnetic properties of ultrathin transition metal oxides on metals
The aim of this project is to correlate the geometric structure of ultra-thin transition metal oxides deposited on metal surfaces with their magnetic and multiferroic properties. The analysis of the geometric structure is primarily based on surface x-ray diffraction in combination with scanning tunnelling microscopy and low energy electron diffraction. In continuation of the studies carried out during the previous term (2008-2011), where we have investigated the BaTiO3/Fe(001) heteroepitaxial system, the project aims to focus on the determination of the adsorption geometry of ultra-thin BaTiO3 films on metals such as Pd(001) and Pt(001) in order to investigate the influence of the (negative) lateral lattice strain (Pd: a=2.75 Å, Da/a=-2.5% and Pt: a=2.77 Å, Da/a=-2.0%) on the film structure especially with regard to the film termination and the direction and magnitude of the polarization within the film. In addition, it is planned to study the structure of the BaTiO3(001) surface, for which no experimental structure determination exists but which is part of the archetype multiferroic Fe/BaTiO3 interface. In a mid-term perspective we also plan to investigate the structural dynamics and the polarization switching of epitaxially grown ultra-thin BaTiO3 films.
Principal Investigators
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PD Dr. Holger Meyerheim ⇒
phone: +49 (0) 345/55 82633 fax: +49 (0) 345/55 11223 |
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Prof. Dr. Jürgen Kirschner ⇒
phone: +49 (0) 345/55 82655 fax: +49 (0) 345/55 11223 |
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