Regensburg 2007 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

DF: Fachverband Dielektrische Festkörper

DF 7: Dielectric and Ferroelectric Thin Films and Nanostructures I

DF 7.2: Vortrag

Dienstag, 27. März 2007, 15:10–15:30, H11

Ferrroelectric PbZr_0.4Ti_0.6O₃ / PbZr_0.6Ti_0.4O₃ superlattices grown on SrTiO₃ (001) by pulsed laser deposition — •Ionela Vrejoiu, Yinlian Zhu, Gwenael Le Rhun, Andreas Schubert, Dietrich Hesse, and Marin Alexe — Max Planck Institute of Microstructure Physics, Weinberg 2, D-06120, Halle, Germany

Artificial heterostructures and superlattices (SLs) involving ferroelectric perovskites have been explored to achieve materials with potentially novel / improved physical properties. Ferroelectric epitaxial superlattices combining tetragonal PbZr_0.4Ti_0.6O₃ and rhombohedral PbZr_0.6Ti_0.4O₃ thin films were grown by pulsed laser deposition (PLD) onto vicinal SrTiO₃ (001) single crystal substrates. Step flow-grown SrRuO₃ layers fabricated also by PLD were employed as bottom electrodes, to allow for the electrical characterization of these PZT-based superlattices. The SLs were subjected to extensive structural characterization by means of (high resolution) transmission electron microscopy and x-ray diffraction, to atomic- and piezo-force microscopy and to macroscopic ferroelectric and dielectric measurements. The thickness of the individual PZT layers was found to play an important role for the structure adopted by the superlattices, which, in particular cases, grow with a uniform tetragonal structure and form 90^∘ a-c domains.