Observation of Nanoscale Ferroelectric Domains Using Super-Higher-Order Nonlinear Dielectric Microscopy
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概要
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Scanning nonlinear dielectric microscopy is a powerful technique for measuring the domain structure of ferroelectrics. We observed congruent LiTaO3 and found the marked enhancement of nonlinear dielectric ``constants'' when the applied tip--sample voltage exceeded a particular threshold value. This is due to domain nucleation activated by a huge electric field under the tip. Moreover, low frequencies (less than a few hundred Hz) did not enhance the nonlinearity. An effectively lower electric field caused by ion conduction in the sample under the tip is a possible reason for the frequency-dependent characteristics of the enhanced nonlinearity for the applied voltage.
- 2012-09-25
著者
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Cho Yasuo
Research Institute Of Electrical Communication Tohoku University
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Hiranaga Yoshiomi
Research Institute Of Electrical Communication Tohoku University
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Yamasue Kohei
Research Institute of Electrical Communication, Tohoku University, Sendai 980-8577, Japan
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Chinone Norimichi
Research Institute of Electrical Communication, Tohoku University, Sendai 980-8577, Japan
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