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L10-ordered FePt granular thin film is the leading candidate for heat assisted magnetic recording (HAMR) media due to its high magnetocrystalline anisotropy constant (∼ 6.6 MJ/m3) that allows smaller thermally stable grain size (∼ 4 nm) [1].
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...
A double-sided wave absorber with specified reflection and transmission coefficients at both sides is proposed. This wave absorber consists of two transparent dielectric layers with three transparent resistance films. Therefore, this wave absorber is transparent and electromagnetic waves are absorbed in both sides. Then it is suitable for the indoor use as electromagnetic wave separator. The design...
In this paper we present data of protein adsorption on topographically altered active polymeric films, investigated using atomic force microscopy (AFM), fluorescence microscopy, and contact angle measurement. The surface wettability of biocompatible polypyrrole (PPy) films was altered via low applied currents, and we have demonstrated switchable hydrophobic-hydrophilic surfaces, used as protein adhesion...
Polarization reversal in a ferroelectric is accompanied by heat generation which causes a temperature rise depending on thermal boundary conditions. An adiabatic condition yields (E: electric field, D: electric displacement, C: heat capacity). The copolymer of vinylidene fluoride (VDF) and trifluoroethylene (TrFE) copolymer is expected to generate a large amount of heat because of its large remanent...
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.
Annealing of thin copolymer films of vinylidene fluoride (VDF) and trifluoroethylene (TrFE) causes a strong increase in grain size as well as in crystallinity. It is known from AFM topographic images that flat-on lamella with diameters of up to 100 mum grow when thin films are annealed at temperatures around 140degC for several hours. To examine the orientation and the polarization state of the lamella,...
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...
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...
Ferroelectric switching characteristics in vinylidene fluoride (VDF)/trifluoroethylene (TrFE) copolymer films have been shown to depend to a variety of factors not only the electric field E and temperature but also film thickness and previous poling conditions. Polarization reversal is believed to progress via nucleation-growth mechanism. However, there remains uncertainty about its microscopic features...
A flexible saturable-absorber mirror was piezoelectrically vibrated for Q-switching of a laser-diode-pumped Nd3+:YVO4 microchip laser. The double Q-switch led to increase of the peak pulse-power and of the repetitive-pulse stability in power and rate.
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