Regensburg 2016 – wissenschaftliches Programm
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DF: Fachverband Dielektrische Festkörper
DF 7: Focus Session: Ferroic Domain Walls I
DF 7.4: Vortrag
Dienstag, 8. März 2016, 10:50–11:10, H25
Probing the interaction of surface adsorbates with ferroelectric domains — •Iaroslav Gaponenko1, Nicolas Stucki2, Albert Verdaguer3, and Patrycja Paruch1 — 1DQMP, University of Geneva, 1211 Geneva, Switzerland — 2University of Applied Sciences Western Switzerland in Geneva (HES-SO/hepia), 1213 Geneva, Switzerland — 3Institut Català de Nanociència i Nanotecnologia (ICN2), Campus UAB, 08193, Bellaterra (Barcelona), Spain
Surface adsorbates are an ubiquitous presence on all materials exposed to ambient environmental conditions. Water, in particular, by virtue of its polar nature, has been shown to interact strongly with domains and domain walls in ferroelectric materials. We have previously focused on the influence of water on polarisation switching dynamics in Pb(Zr0.2Ti0.8)O3 thin films, and demonstrated its key role (together with redistribution of oxygen vacancies) in the reversible control of electrical transport at 180° domain walls in this material. However, in these systems the reciprocal effect of polarization also needs to be considered, as it will induce changes in the physics of surface adsorbates.
Here, we present our studies of the interaction of adsorbed water with the surface of thin films of Pb(Zr0.2Ti0.8)O3 by combined topographical and electrostatic force microscopy imaging. Comparing domains written with positive and negative tip voltage, and the as-grown state of the film, we map out the changes in the strength of the electrostatic interactions between the microscopy tip and surface as a function of changing humidity, and demonstrate that the surface arrangement of the water depends on the ferroelectric domain orientation.