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Ferroelectric switching characteristics during continuous polarization reversal were investigated in thin vinylidene fluoride/trifluoroethylene copolymer films by using a train of bipolar on-off electric field pulses. It was found that polarization reversal is accelerated as the pulse width Δt is decreased whereas it is decelerated as Δt is increased. For a given Δt, the switching time ts depends...
Copolymers of vinylidene fluoride, VDF, and trifluoroethylene, TrFE, are representative ferroelectric polymers. Their local properties, such as domain structure and domain wall motion, are not well known because of its complex structure. In the isothermally crystallized samples, we can obtain lamellae that grow separately on the substrates. Then in order to discuss the local state of the polarization...
In this paper, we use mica for clay and report on a finding of very large remanent polarization in the PVDF/mica nanocomposites prepared by melt crystallization and solvent casting.
The copolymer of vinylidene fluoride (VDF) with trifluoroethylene (TrFE) has attracted much interest due to the potential use in nonvolatile memory devices with easy formability. A repetitive application of electric stress causes a decrease of switchable polarization. This phenomenon, referred to as fatigue, is one of the primary sources of concern in the ferroelectric memory devices. Having realized...
Piezoelectric response force microscopy, PFM, is a kind of SPM technique. It measures the change of the position of surface in accordance with the applied voltage, giving local piezoelectric activity. This method is widely applied to ferroelectric ceramics as well as to ferroelectric polymers. We used this method to study the dynamics of polarization reversal in thin films of VDF/TrFE copolymer.
The copolymer of vinylidene fluoride (VDF) with trifluoroethylene (TrFE) is a ferroelectric polymer undergoing polarization reversal as a result of rotational motions of molecules about their chain axes. It requires a very high electric field of approximately 100 MV/m for polarization reversal. Therefore, the thickness reduction below 50 nm is a technological requirement to achieve low-voltage operations...
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