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DF: Dielektrische Festkörper

DF 4: Internal Symposium “Ferroelectric Materials for Smart Structures”

DF 4.9: Talk

Tuesday, March 28, 2006, 12:30–12:50, K{\"O}N Farb

Electron Holography for ferroelectric characterization — •Hannes Lichte, Marianne Reibold, Karin Vogel, Christopher Matzeck, and Michael Lehmann — Institute for Structure Physics, Technische Universität Dresden, Dresden, Germany

Electron holography in a Transmission Electron Microscope gives quantitative access to magnetic and electric fields by evaluating their phase shifting effect on the electron wave. Electric fields stemming from the ferroelectric polarisation have been identified and analyzed by means of electron holography showing domain structures in sub-micron dimensions. Furthermore, at atomic dimensions, dipole-like structures are found in the holographic phase images of unit cells of BaTiO3, which strongly resemble the assumed atomic dipoles. The found ordering of these dipoles suggests that nano-domains exist which are only several unit cells wide.