Ferroelectric domain kinetics in congruent LiTaO₃

Venkatraman Gopalan Materials Research Laboratory and Dept. of Materials Science and Engineering, Pennsylvania State University, University Park, PA, 16802

A. Itagi Dept. of Electrical and Computer Engineering, Carnegie Mellon University, Pittsburgh, PA, 15213

S. Gerstl Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, NM, 87545

P. Swart Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, NM, 87545

Q. X. Jia Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, NM, 87545

T. E. Mitchell Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, NM, 87545

T. E. Schlesinger Dept. of Electrical and Computer Engineering, Carnegie Mellon University, Pittsburgh, PA, 15213

D. D. Stancil Dept. of Electrical and Computer Engineering, Carnegie Mellon University, Pittsburgh, PA, 15213

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Abstract

We present real-time studies of nucleation and growth of 180° ferroelectric domains in congruent LiTaO₃ under an external electric field using optical microscopy. The measured wall velocities are an order of magnitude higher than those reported before using ex-situ techniques. Merger of growing domains form serrated fronts which show a futher order of magnitude increase in wall velocity. A time dependent velocity is required in the Avrami theory to explain the change in domain area versus time at a constant electric field. We believe that these features of domain switching must be considered when studying ferroelectrics in general.

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Ferroelectric domain kinetics in congruent LiTaO₃