Thickness Dependence of Ferroelectricity in Langmuir-Blodgett Multilayer Films of Hemicyanine Dyes
The thickness dependence of ferroelectricity in hemicyanine Langmuir-Boldgett multilayer films was reported in this paper. By the observed ferroelectric hysteresis loop, it was found that the coercive field decreased with increasing of film thickness monotonously and may be approximated
by a power law Ec ∝ N
−4/3 in the range from 30 to 200 nm, which is consistent with other conventional ferroelectric materials. The measurement of dielectric properties give the optimum thickness about 60 nm of hemicyanine LB films and their optimum value
as ferroelectric storage-devices has the same order of magnitude as copolymer's P(VDF-TrFE) (70:30 mol%).
Keywords: COERCIVE FIELD; FERROELECTRICITY; HYSTERESIS LOOP; LANGMUIR-BLODGETT FILMS; OPTIMUM VALUE
Document Type: Research Article
Publication date: 01 January 2012
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