Regensburg 2007 – wissenschaftliches Programm

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DF: Fachverband Dielektrische Festkörper

DF 11: Poster Session

DF 11.6: Poster

Donnerstag, 29. März 2007, 14:30–18:00, Poster C

In-situ Electron Holography of Ferroelectric Polarization Switching — •Christopher Matzeck, Hannes Lichte, and Bernd Einenkel — TU Dresden, Triebenberg-Labor

For many applications of ferroelectrics, e.g. nonvolatile memories, their behavior under external electric fields is extremely important. Since ferroelectric polarization modulates the phase of the electron wave in a TEM and electron holography is capable of measuring this, it is possible to determine the projected polarization in principle. Mathematically, the projected polarization is directly related to the gradient of the phase shift [1]. This makes electron holography a powerful tool for investigation of ferroelectric domains.

Experiments under field switching are done with a special TEM-holder with an electrical feedthrough and individual prepared specimens to apply an external electric field perpendicular to the electron beam. This is important because only these so-called in-plane components of the polarization modulate the electron wave.

References:

[1] H. Lichte, M. Reibold, K. Vogel, M. Lehmann, Ultramicroscopy 93 (2002) 1999

[2] The financial support from the Deutsche Forschungsgemeinschaft for the Research Group on Ferroic Functional Components FOR520 is gratefully acknowledged