Research Papers in Physics and Astronomy

 

Date of this Version

January 2000

Comments

Published by American Physical Society. Physical Review Letters 84, 175-8 (2000). http://prl.aps.org. Copyright © 2000 American Physical Society. Permission to use.

Abstract

The Landau-Ginzburg theory of ferroelectricity predicts the intrinsic coercive field for polarization reversal, but the observed extrinsic coercive field is always much smaller as a result of nucleation, dynamic processes not covered by the static theory. We have realized the intrinsic coercive field for the first time, in two-dimensional Langmuir-Blodgett polymer films as thin as 1 nm. The measured coercive field is in good agreement with the theoretical intrinsic value, exhibits the expected dependence on temperature, and does not depend on thickness below 15 nm.

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