Surface screening of written ferroelectric domains in ambient conditions

We have combined Piezoresponse Force Microscopy and Kelvin Probe Force Microscopy (KPFM) to study screening charge dynamics in written domains on PbZr0.2Ti0.8O3 (PZT) thin film surfaces under a controlled environment and at variable temperature. The screening dynamics decayed exponentially on a timescale of tens of minutes, consistently with what we expected for water-mediated surface diffusion of ionic species. Variable-temperature KPFM measurements showed variations in surface potential due to temporary unbalanced surface screening charges. Low humidity experiments revealed gradual incorporation of positive charges onto the surface, even in a non-reactive environment (N-2), as well as deceleration of the screening dynamics upon reversal of the temperature variation. Our work may serve as a guide for future studies on the dynamics and nature of adsorbates on polarized PZT thin films. (C) 2013 AIP Publishing LLC

Published in:
Journal Of Applied Physics, 113, 18
Presented at:
21st IEEE International Symposium on Applications of Ferroelectrics held jointly with 11th European Conference on the Applications of Polar Dielectrics and 4th Conference on Piezoresponse Force Microscopy and Nanoscale Phenomena in Polar Materials
Melville, Amer Inst Physics

 Record created 2013-10-01, last modified 2018-03-17

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