Dresden 2006 – wissenschaftliches Programm

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CPP: Chemische Physik und Polymerphysik

CPP 18: Polymer Materials II

CPP 18.5: Vortrag

Mittwoch, 29. März 2006, 16:45–17:00, ZEU 114

Spatially Inhomogeneous Polarization Switching in Poly(Vinylidene Fluoride) Observed with Focused Thermal Pulses — •Axel Mellinger, Marco Schreiber, Michael Wegener, and Werner Wirges — Department of Physics, University of Potsdam, Am Neuen Palais 10, 14469 Potsdam

Poly(vinylidene fluoride) and its colpoymer with trifluoroethylene are well-known ferroelectric polymers, with numerous applications for piezo- and pyroelectric transducers. However, the dynamics of the electrical poling process is still the subject of intense investigation. Recent progress in the non-destructive, three-dimensional mapping of space-charge and polarization profiles with thermal pulses [1] allows the spatially resolved imaging of the polarization switching process as the material is subjected to periodic electric fields at mHz frequencies. The polarization maps with a lateral resolution of 50 µm and a near-surface depth resolution of better than 0.4 µm reveal a highly inhomogeneous switching, with a partial pinning of the polarization in a 1 µm surface layer.

[1] A. Mellinger, R. Singh, M. Wegener, W. Wirges, R. Gerhard-Multhaupt and S. B. Lang, Appl. Phys. Lett. 86, 082903 (2005).