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DF: Dielektrische Festkörper

DF 1: Internal Symposium “Integrated Electroceramic Functional Structures”

DF 1.7: Vortrag

Montag, 27. März 2006, 11:50–12:10, M{\"U}L Elch

Domain structure of ferroelectric nanograins by piezoelectric force microscopy — •Serge Röhrig¹, Frank Peter¹, Andreas Rüdiger¹, Sven Clemens², Theo Schneller², and Rainer Waser^1,2 — ¹Center of Nanoelectronic Systems for Information Technology, Research Center Jülich, 52425 Jülich, Germany — ²Institut für Werkstoffe der Elektrontechnik 2, RWTH Aachen, Sommerfeld Str. 24, 52074

Piezoelectric force microscopy in vertical and lateral operation has made tremendous progress in the characterization of ferroelectric nanostructures. We discuss some of our latest findings in laterally confined ferroelectrics of BaTiO₃ on SrRuO₃ and PbTiO₃ on Pt. Special attention is devoted to the sample-tip interaction as lateral PFM picks up signals that are prohibited by symmetry in an otherwise ideal c-axis oriented system. Lead titanate nanograins are fabricated by chemical solution deposition and post-treated by chemical mechanical polishing to modify their size distribution. Their ferroelectric functionality is proven by inversion of the piezoelectric tensor. We give an outlook to an upcoming new technique of tip-enhanced Raman spectroscopy on ferroelectric nanoislands and discuss some key issues like heat dissipation and the detection of soft-modes.