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Displacement Charge Patterns and Ferroelectric Domain Wall Dynamics Studied by In-Situ Tem

Published online by Cambridge University Press:  10 February 2011

A. Krishnan ,
M. M. J. Treacy ,
M. E. Bisher ,
P. Chandra  and
P. B. Littlewood
A. Krishnan
Affiliation:
NEC Research Institute, Inc. 4 Independence Way, Princeton, NJ 08540
M. M. J. Treacy
Affiliation:
NEC Research Institute, Inc. 4 Independence Way, Princeton, NJ 08540
M. E. Bisher
Affiliation:
NEC Research Institute, Inc. 4 Independence Way, Princeton, NJ 08540
P. Chandra
Affiliation:
NEC Research Institute, Inc. 4 Independence Way, Princeton, NJ 08540
P. B. Littlewood
Affiliation:
Cavendish Laboratory, Cambridge University, Cambridge, UK
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Abstract

We have observed the growth of domains in ferroelectric barium titanate and potassium niobate using a transmission electron microscope. When domains move in response to electric fields we see a scaling effect where the fine scale domain structure is activated first, followed by larger length-scale patterns. Curvature and tilting of domain walls leads to local uncompensated displacement charge and external fields can interact with these charged walls. In this paper, we posit that the presence of displacement charge on domain walls is important for polarization switching. Charge-neutral domain configurations are in a lower energy state and are harder to switch. We argue that the number of charge-neutral, low energy domain configurations can increase with time. This mechanism provides an intrinsic contribution to ferroelectric fatigue.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 596: Symposium Y – Ferroelectric Thin Films VIII , 1999 , 161
Copyright
Copyright © Materials Research Society 2000

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