Regensburg 2010 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 60: Poster Session III (Methods: Atomic and electronic structure; Methods: electronic structure theory; Methods: Molecular simulations and statistical mechanics; Methods: Sanning probe techniques; Methods: other (experimental); Methods: other (theory) )

O 60.26: Poster

Mittwoch, 24. März 2010, 17:45–20:30, Poster B2

STM and STS studies of ferroelectric domain structures on BaTiO₃(001) and BaTiO₃(111) single crystals — •Maik Christl, Christian Hagendorf und Wolf Widdra — Institute of Physics, Martin-Luther-Universität Halle-Wittenberg, Germany

A new method of characterizing ferroelectric domain structures on nanometer scale by using a STM is presented. We demonstrate a domain contrast of various domain arrangements based on dI/dV maps. On BaTiO₃(001) we can differentiate between ferroelectric c⁺, c⁻, and a domains based on STM and STS. Additionally domain boundaries between 90^∘ in-plane polarized domains become visible in STS maps. During heating BaTiO₃(111) above the Curie temperature, a modified domain pattern is found. The ferroelectric domain structure can be modified locally by tunneling at higher bias voltages. This STM-induced domain nanostructuring will be discussed in comparison to recent AFM studies [1].

[1] A. Gruverman et al., Scanning Force Microscopy Studies of Domain Structure in BaTiO₃ Single Crystals, Jpn. J. Appl. Phys. Vol. 36 (1997) pp.2207-2211