On bistable states retention in ferroelectric langmuir-blodgett films

A. R. Geivandov; S. P. Palto; S. G. Yudin; V. M. Fridkin; L. M. Blinov; S. Ducharme

doi:10.1117/12.515729

8 August 2003 On bistable states retention in ferroelectric Langmuir-Blodgett films

A. R. Geivandov, S. P. Palto, S. G. Yudin, V. M. Fridkin, L. M. Blinov, S. Ducharme

Proceedings Volume 5122, Advanced Organic and Inorganic Optical Materials; (2003) https://doi.org/10.1117/12.515729
Event: 2003 Chapter books, 2003, Bellingham, WA, United States

Abstract

A new insight into the nature of ferroelectricity is emerging from the study of ultra-thin ferroelectric films prepared of poly(vinylidene fluoride with trifluoroethylene) copolymer using Langmuir-Blodgett (LB) technique. Unique properties of these films indicate the existence of two-dimensional ferroelectricity. The retention of two polarized states in ferroelectric polymer LB films is studied using nonlinear dielectric spectroscopy. The technique is based on phase sensitive measurements of nonlinear dielectric spectroscopy. The amplitude of the current response at the 2nd harmonic of the applied voltage is proportional to the magnitude of the remnant polarization, while its phase gives the sign. We have found that 10 - 20 mm thick LB films can show fast switching time and long retention of the two polarized states. Nevertheless, LB films show a pronounced asymmetry in switching to the opposite states. Possible mechanisms of such behavior are discussed.

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A. R. Geivandov, S. P. Palto, S. G. Yudin, V. M. Fridkin, L. M. Blinov, and S. Ducharme "On bistable states retention in ferroelectric Langmuir-Blodgett films", Proc. SPIE 5122, Advanced Organic and Inorganic Optical Materials, (8 August 2003); https://doi.org/10.1117/12.515729

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