Journal
JOURNAL OF APPLIED PHYSICS
Volume 104, Issue 6, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.2978216
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Funding
- National Science Foundation [DMR-0605292]
- Materials Research Center of Northwestern University [DMR-0076097]
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The nature of ferroelectric domain dynamics in polydomain epitaxial barium titanate thin film was investigated using the linear electro-optic effect. The dynamic response was studied as a function of bias field under pulsed excitation. Upon removal of the bias pulse a millisecond long transient response was observed that is attributed to 90 degrees domain reversal. The dynamic response and its field dependence are described by the Kohlrausch-Williams-Watts stretched exponential function in time with an average relaxation time . This average time for polarization reversal is a function of applied electric field E and is given by =tau(0) exp(alpha/E), where tau(0) is the prefactor and a is the activation field. The measured activation fields depended on bias. Activation fields of 2.0 and 0.7 V/mu m measured under high and low bias conditions are comparable to those observed for bulk barium titanate. (c) 2008 American Institute of Physics. [DOI: 10.1063/1.2978216]
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