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Regensburg 2010 – wissenschaftliches Programm

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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 Soergel11Institute 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.

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