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Regensburg 2007 – wissenschaftliches Programm

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DF: Fachverband Dielektrische Festkörper

DF 10: Dielectric and Ferroelectric Thin Films and Nanostructures III

DF 10.3: Vortrag

Donnerstag, 29. März 2007, 15:10–15:30, H48

Electric Fine Structure in Ferroelectrics by Electron Holography — •Hannes Lichte1, Martin Linck1, Marianne Reibold1, and Koichiro Honda21Triebenberg Laboratory, Institute of Structure Physics, Technische Universität Dresden, 01062 Dresden — 2Fujitsu Laboratories Ltd, Atsugi 243-0197, Japan

In many materials, the arrangement of atoms is mainly interesting in the sense that it produces certain intrinsic fields, such as functional magnetic or electric fields. This is true for example, for ferroelectrics and those materials with regular charge modulation [1]. Since, in a TEM, these fields modulate the phase of the electron waves, they can best be analyzed by electron holography [2]. By holography, we analyze the electric structure of ferroelectrics (BaTiO3, PZT, PTO,..) at medium resolution [3], but also the details on a nanometer scale. It turns out that we can distinguish between stacked ferroelectric and non-ferroelectric layers, and determine ordering and orientation of the polarization in nanometer dimensions. Financial support by the German Research Society (DFG) through FOR 520 is gratefully acknowledged.

[1] Roeder et al., this conference.

[2] Lichte et al., Ultramicroscopy 93 (2002) 199.

[3] Matzeck et al., this conference.

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