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DF: Dielektrische Festkörper

DF 5: Dielektrische und ferroelektrische dünne Schichten und Nanostrukturen I

DF 5.4: Talk

Monday, March 7, 2005, 11:20–11:40, TU TC6

Characterization of laterally confined ferroelectric nanostructures — •Andreas Rüdiger¹, Andreas Rüdiger¹, Frank Peter¹, Sven Clemens², Kristof Szot¹, Theo Schneller², Stephan Tiedke³, Rainer Waser¹, Frank Peter¹, Sven Clemens², Kristof Szot¹, Theo Schneller², and Stephan Tiedke³ — ¹cni-center of nanoelectronic systems for information technology, FZ Jülich, 52425 Jülich — ²Institut für Werkstoffe der Elektrotechnik II, RWTH Aachen, 52074 Aachen — ³Aixacct-Systems GmbH, Dennewartstr. 25-27, 52068 Aachen

Ferroelectricity is a cooperative phenomenon of coupled electric dipoles in a crystal lattice. For only a few nanometers lateral extension, Landau theory predicts the disappearance of macroscopic polarization. As we now experimentally approach this regime, quantitative measurements become imperative to determine the phase change behavior at this critical size. As it turns out, the ultimate limit of ferroelectricity is to a large extent governed by extrinsic effects such as lattice mismatch with the substrate, local stoichiometry, and surface contaminations. We discuss a new fabrication method, recent measurements and ways to make use of some side-effects. Direct electrical characterization and piezoelectric force microscopy of individual structures as well as a careful integration over numerous structures are presented.