Intrinsic and extrinsic effects on the ferroelectric switching of thin poly(vinylidene fluoride/trifluoroethylene) copolymer films

Mai, Manfang; Ke, Shanming; Lin, Peng; Zeng, Xierong

doi:10.1063/1.4947142

Cited by 14 publications

(9 citation statements)

References 32 publications

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“…Fitting eq to the experimental data, we obtained t ∞ and E a c t for all nanocomposites. The activation field and t ∞ for P(VDF-TrFE) pristine film amounted to 800 MV/m and 8 ns, respectively, in perfect agreement with previous reported values. ,,− The activation field for polarization reversal in nucleation-limited regime amounts to 1 GV/m. ,, Observation of high E a c t for the nanocomposites indicates that the polarization reversal is nucleation limited. We note that switching dynamics in P(VDF-TrFE) thin films can be affected by many parameters such as sample processing conditions, thickness, electrodes, electric fields, temperature, and prepolarization conditions, to name a few.…”

Section: Resultssupporting

confidence: 88%

Thin-Film Polymer Nanocomposites for Multiferroic Applications

Dehsari

Kumar

Saad

et al. 2018

ACS Appl. Nano Mater.

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Polymeric nanocomposite thin films of magnetic nanoparticles blended with the ferroelectric polymer poly-(vinylidene fluoride-co-trifluoroethylene) (P(VDF-TrFE)) are promising candidates for multiferroic applications. To date, only thick-film multiferroic nanocomposites have been reported. Fabrication of nanocomposite thin films along with the study of the ferroic properties with magnetic nanoparticle loading is crucial for the realization of functional devices. However, systematic studies, and in particular the dynamic of ferroelectric polarization switching and a solid understanding of the microstructure formation in thin films, are still missing. Here, we present solution-processed P(VDF-TrFE):magnetic nanoparticle thin films for multiferroic applications, wherein the ferroic properties, polarization switching dynamic, and the microstructure formation are studied as a function of nanoparticle loading. Our results demonstrate that as the nanoparticle loading increases, the ferroelectric polarization of the nanocomposite decreases and the saturation magnetization increases. Moreover, the presence of the nanoparticles substantially increases the polarization switching time and shifts the switching mechanism to one-dimensional growth. The P(VDF-TrFE):magnetic nanoparticle solution phase separates upon film casting. The crystalline regions of P(VDF-TrFE) are pure. The amorphous regions accommodate the nanoparticles. The phase separation leads to agglomerated nanoparticles at higher loadings, and eventually stratified vertical phases occur. The insight gained from the study of thin-film microstructure would help to optimize the performance of the nanocomposite for multiferroic applications and can be used for better understanding of the polymer:nanoparticle nanocomposites for energy storage and memory applications.

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Section: Resultssupporting

confidence: 88%

Thin-Film Polymer Nanocomposites for Multiferroic Applications

Dehsari

Kumar

Saad

et al. 2018

ACS Appl. Nano Mater.

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“…In ferroelectric polymers [e.g. PVDF and P(VDF-TrFE)], polarization reversal occurs as a result of 180 • rotations of individual chain molecules around their axes and the switching time ranges from microseconds to seconds depending upon the strength of the applied field and the film thickness [63]. Nevertheless, hysteresis measurements can only be made practically at low frequencies (1-10 kHz) because of the critical heat generation associated with electromechanical hysteresis loss [10].…”

Section: Ferroelectric Domains and Polarization Dynamicsmentioning

confidence: 99%

Recent advances in molecular ferroelectrics

Bergenti¹

2021

J. Phys. D: Appl. Phys.

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Due to their structural flexibility, tunability and easy processing, molecular ferroelectric materials have emerged to complement the well-known ferroelectric perovskite oxides. A number of compounds have been investigated but, with the exception of polymeric polyvinylidene fluoride, most have not succeeded in achieving their potential, mainly because of their poor ambient stability. It is only recently, with the surge of electronic type ferroelectricity, that molecular ferroelectrics with superior properties have been synthesized, making them competitive with respect to oxides. Nevertheless, the uniaxial nature of most of the compounds still represents the main bottleneck because it limits the transposition of the bulk properties into films. A possible solution is represented by the use of multiaxial molecular compounds or of low-dimensional systems. In this review, we highlight the main achievements in this field and summarize the open questions to be addressed if molecular ferroelectrics are to be exploited in devices.

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“…Since the discovery of ferroelectricity more than 100 years ago, many applications have been developed based on its unique property to change the polarization state/orientation using an external electric field. , Based on this bi-stability, ferroelectric (FE) materials became the core of FE random access memory or FE field-effect transistor (FEFET) electronic devices. − Even if non-volatility is a key characteristic, the dynamic of polarization switching − also plays an important role for binary digital devices and determines important parameters such as the writing speed, writing voltage, stability in time, or fatigue.…”

Section: Introductionmentioning

confidence: 99%

Negative Capacitance and Switching Dynamics Control Via Non-Ferroelectric Elements

Boni

Pătru

Filip

et al. 2022

ACS Appl. Energy Mater.

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Complex ferroelectric structures with dielectric inter-layers may become possible alternatives for neuromorphic computing and low-power field-effect transistors since they exhibit multiple polarization states and negative capacitance. However, the effects on the switching characteristics due to the electric properties of the non-ferroelectric circuit element have not been clearly evaluated so far. A high-resistance or low-capacitance element is usually associated with an increased depolarization field and eventually with suppression of polarization but without further consideration of the electrostatic differences. Therefore, we show that switching behavior is dramatically changed if the non-FE element is a resistive component or a capacitive one. This is reflected by either an increased apparent coercive field or imprint, respectively. A negative capacitance regime was observed at different moments but strongly depends on the nature of the non-ferroelectric element. The voltage on the ferroelectric component remains constant during switching, which is a fingerprint of the system passing through non-equilibrium states. Therefore, we propose an algorithm to recover the S-shape of polarization dependence on the ferroelectric internal voltage during the slowed transition between the two stable states of polarization.

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Intrinsic and extrinsic effects on the ferroelectric switching of thin poly(vinylidene fluoride/trifluoroethylene) copolymer films

Cited by 14 publications

References 32 publications

Thin-Film Polymer Nanocomposites for Multiferroic Applications

Thin-Film Polymer Nanocomposites for Multiferroic Applications

Recent advances in molecular ferroelectrics

Negative Capacitance and Switching Dynamics Control Via Non-Ferroelectric Elements

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