Dynamic response of polydomain ferroelectric barium titanate epitaxial thin films and its field dependence

被引：0

作者：

Liu, Zhifu ^{[1
]}

Meier, A.L. ^{[1
]}

Wessels, B.W. ^{[1
]}

机构：

[1] Department of Materials Science and Engineering, Materials Research Center, Northwestern University, Evanston, IL 60208, United States

来源：

| 1600年 / American Institute of Physics Inc.卷 / 104期

基金：

美国国家科学基金会;

关键词：

Ferroelectric thin films - Ferroelectricity - Electric fields - Exponential functions - Chemical activation - Impulse response;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

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 90domain 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 〈τ〉. This average time for polarization reversal is a function of applied electric field E and is given by 〈τ〉 = τ0 exp (α/E), where τ0 is the prefactor and α is the activation field. The measured activation fields depended on bias. Activation fields of 2.0 and 0.7 V/μm measured under high and low bias conditions are comparable to those observed for bulk barium titanate. © 2008 American Institute of Physics.

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