Regensburg 2016 – wissenschaftliches Programm

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DF: Fachverband Dielektrische Festkörper

DF 11: Poster

DF 11.31: Poster

Mittwoch, 9. März 2016, 18:00–20:00, Poster E

Electrostatic force microscopy at domain walls of LiNbO₃ — •Manuel Becker and Elisabeth Soergel — Physikalisches Institut, University of Bonn

The polar z-faces of LiNbO₃, usually investigated by PFM for mapping the domain patterning, can not be imaged using non-contact scanning force microscopy; the electrostatic forces owing to the surface polarization charges being to strong. It is, however, possible to access the domain walls via the non-polar faces. Here, electrostatic force microscopy (EFM) can be employed to record the local charge distribution accumulated at the walls which, by means of light or heat, can be modified on demand. Investigations using EFM, thus gaining information on the density of free charge carriers, might allow for a better understanding of the origin for the domain wall conductivity.