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O: Fachverband Oberflächenphysik
O 11: Methods: Scanning probe techniques II
O 11.8: Vortrag
Montag, 22. März 2010, 16:45–17:00, H32
Sol-gel derived ferroelectric nanoparticles investigated by piezoresponse force microscopy — •Florian Johann1, Tobias Jungk1, Susanne Lisinski2, Akos Hoffman1, Lorenz Ratke2, and Elisabeth Soergel1 — 1Institute of Physics, University of Bonn, Wegelerstr. 8, 53115 Bonn, Germany — 2Institute for Material Physics in Space, DLR, Linder Höhe, 51147 Cologne, Germany – *Present address of F. Johann: Max Planck Institut for Microstructure Physics, Weinberg 2, 06120 Halle, Germany
Piezoresponse force microscopy (PFM) was used to investigate the ferroelectric properties of sol-gel derived LiNbO3 nanoparticles. To determine the degree of ferroelectricity we took large-area images and performed statistical image-analysis. The ferroelectric behavior of single nanoparticles was verified by poling experiments using the PFM tip. Finally we carried out simultaneous measurements of the in-plane and the out-of-plane piezoresponse of the nanoparticles, followed by measurements of the same area after rotation of the sample by 90∘ and 180∘. Such measurements basically allow to determine the direction of polarization of every single particle.