Electromechanical properties of ferroelectric polymers: Finsler geometry modeling and a Monte Carlo study

Egorov, V. I.; Максимова, О. Г.; Koibuchi, Hiroshi; Bernard, Chrystelle; Chenal, Jean-Marc; Lame, Olivier; Diguet, Gildas; Sebald, Gaël; Cavaillé, J.Y.; Takagi, Toshiyuki

doi:10.1016/j.physleta.2021.127230

Cited by 3 publications

(4 citation statements)

References 21 publications

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“…Nevertheless, as shown in Figure 7d, P(VDF‐TrFE) 65/35 mol% has the lower maximum and remnant polarization values ( P s ~ 13.9 μC cm − and P r ~ 10.4 μC cm −2 in Figure 7c) than those of 80/20 mol% ( P s ~ 15.2 μC cm −‐2 and P r ~ 11.3 μC cm −2 in Figure 7a) and 75/25 mol% ( P s ~ 14.7 μC cm −‐2 and P r ~ 10.7 μC cm −2 in Figure 7b) under electrical field of 200 MV m −1 , respectively. Moreover, compared with ice‐water cooling samples, the P–E loops of annealing P(VDF‐TrFE) films gradually tend to rectangular shape and the coercivity field strength increases correspondingly with the increase of electric field, further indicating annealing favors the content of ferroelectric β phase 47–52 . The reason is that 140°C nearing T C of P(VDF‐TrFE) provides sufficient time for the arrangement of all‐trans molecular chains within the molecules.…”

Section: Resultsmentioning

confidence: 99%

“…Moreover, compared with ice-water cooling samples, the P-E loops of annealing P(VDF-TrFE) films gradually tend to rectangular shape and the coercivity field strength increases correspondingly with the increase of electric field, further indicating annealing favors the content of ferroelectric β phase. [47][48][49][50][51][52] The reason is that 140 C nearing T C of P(VDF-TrFE) provides sufficient time for the arrangement of all-trans molecular chains within the molecules. However, when annealing P(VDF-TrFE) at 200 C exceeding the melting point of the films, the crystal region is destroyed and is obliged to recrystallize when the temperature drops from 200 C to room temperature quickly.…”

Section: Influence Of Annealing Temperature On Electrical Properties ...mentioning

confidence: 99%

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Disclosing the dependencies of ferroelectric and piezoelectric performances on crystalline states of P(VDF‐TrFE) films by molecular dynamics simulations

Shi,

Xia,

Wang

et al. 2024

J of Applied Polymer Sci

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We present a molecular dynamics simulation method including x‐ray diffractometer pattern calculation, mean square displacement (MSD), and nonbonding energy distribution (NED) to disclose the dependencies of condensed structure on its crystalline process of the poly(vinylidene fluoride‐trifluoroethylene) (P(VDF‐TrFE)) films. For comparison, the P(VDF‐TrFE) solution is casted into the films, and followed that different thermal processes are performed to fabricate the crystalline states of the films. Simulation and experimental results have good consistency, indicating that high temperature annealing can effectively promote all‐trans β phase in the crystal region of P(VDF‐TrFE). As such, P(VDF‐TrFE) 80/20 mol% annealing at 140°C shows a higher MSD (~27.5 Å2) and a faster reducing rate of NED than that of other films, contributing to a large maximum polarization (Ps) of ~15.5 μC cm−2, high a remnant polarization (Pr) of ~11.8 μC cm−2, and an attractive piezoelectric strain coefficient (d33) of −27.1 pC N−1 under 200 MV m−1, respectively, and providing a reference for the applications of P(VDF‐TrFE) in flexible sensors, actuators, transducers, and so forth.

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Section: Resultsmentioning

confidence: 99%

Section: Influence Of Annealing Temperature On Electrical Properties ...mentioning

confidence: 99%

Disclosing the dependencies of ferroelectric and piezoelectric performances on crystalline states of P(VDF‐TrFE) films by molecular dynamics simulations

Shi,

Xia,

Wang

et al. 2024

J of Applied Polymer Sci

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“…Therefore, room temperature ferroelectromagnetism is best suited for NVFeRAM and soft magnetic memory applications [20]. The electromechanical nature is evinced by the coexistence of mechanical and electrical properties in some ferroelectric polymer materials [21] because of (i) large deformations under external electric fields, (ii) the negative longitudinal piezoelectric coefficient, and (iii) the response of mechanical strain to the square of the polarization [22]. Hence, these properties of materials are commonly used in design actuators [21].…”

Section: Introductionmentioning

confidence: 99%

Multi-functional attributes of rare earth double doped SrBi₂Nb₂O₉ ferroelectric system

Nagamani¹,

Kiran²,

B³

et al. 2022

Phys. Scr.

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The ferroelectric perovskite SrBi2Nb2O9 (SBN) material with a low concentration of double doping at the Bi-site of SBN was studied to understand its influence and usefulness in integrated optoelectronic, soft magnetic memory devices and wear-resistant tribomaterials. The aim of the present study is double doping of SBN with a set of rare earth elements Pr3+/Dy3+ (SBPDN), Pr3+/Gd3+ (SBPGN), Pr3+/Sm3+ (SBPSN), and Pr3+/Y3+ (SBPYN) at the Bi-site of SBN to establish the multifunctional ceramic nature pertaining to diverse applications. XRD with Rietveld refinement analysis acknowledged a single-phase orthorhombic structure with an increase in lattice parameters and unsystematic changes in crystallite size. SEM study indicated that the samples possessed non-uniformly distributed needle-shaped grains. The purity of the material and the detection of functional groups were received from the EDS and FTIR spectroscopy. Structural modifications in SBN have been determined based on a diffuse reflectance spectroscopy (DRS) study and therefore the band gap values decrease from 2.98 eV (SBN) to 2.70 eV (double doping) because of the growth of distortion in the structure and pronounced increase in the density of localized states. Photoluminescence (PL) study on double doped SBN material with an excitation wavelength of 320 nm has yielded a novel red emission at 609 nm, that may be useful for white LEDs. The ferromagnetic signature in the studied materials was confirmed from the room temperature VSM study. Noticed mild wear and a low coefficient of friction in the studied materials of SBPDN and SBPSN compared to other studied ceramic samples from mechanical studies. The simultaneous manifestation of optical, magnetic, and mechanical properties by double-doped SBN ceramics keeps the materials as multi-functional candidates for optoelectronic devices, soft magnetic memory devices, and wear-resistant tribomaterials.

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“…In this paper, using Finsler geometry (FG) modeling, which is a mathematical framework for describing anisotropic phenomena [36][37][38], we study two possible models for the deformation of skyrmions and magnetic stripes [39]. In one of the models, the FMI coefficient is deformed to be λ x = λ y , while DMI is isotropic, and in the other model, the DMI coefficient is deformed to be D x = D y while FMI is isotropic.…”

Section: Introductionmentioning

confidence: 99%

Finsler geometry modeling and Monte Carlo study of skyrmion shape deformation by uniaxial stress

et al. 2021

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Skyrmions are topologically stable and energetically balanced spin configurations appearing under the presence of ferromagnetic interaction (FMI) and Dzyaloshinskii-Moriya interaction (DMI).Much of the current interest has focused on the effects of magneto-elastic coupling (MEC) on these interactions under mechanical stimuli, such as uniaxial stresses for future applications in spintronics devices. Recent studies suggest that skyrmion shape deformations in thin films are attributed to an anisotropy in the coefficient of DMI, such that D x = D y . This anisotropy is naturally understood as an effect of MEC, however, the relationship between MEC and anisotropy in DMI remains to be clarified. In this paper, we study this problem using a new modeling technique constructed based on Finsler geometry (FG). In the FG model, an MEC is implemented purely geometrically, and the implemented MEC dynamically deforms the coefficients of FMI and DMI to be direction-dependent. This modeling technique is in sharp contrast to the standard model of MEC, in which anisotropic constants are explicitly assumed as an input parameter. Two possible FG models are examined: In the first (second) model, the FG modeling prescription is applied to the FMI (DMI) Hamiltonian. We find that these two different FG models' results are consistent with the reported experimental data for skyrmion deformation. We also study responses of spins under lattice deformations corresponding to uniaxial extension/compression and find a clear difference between these two models in the stripe phase, elucidating which interaction of FMI and DMI is deformed to be anisotropic by uniaxial stresses.

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Electromechanical properties of ferroelectric polymers: Finsler geometry modeling and a Monte Carlo study

Cited by 3 publications

References 21 publications

Disclosing the dependencies of ferroelectric and piezoelectric performances on crystalline states of P(VDF‐TrFE) films by molecular dynamics simulations

Disclosing the dependencies of ferroelectric and piezoelectric performances on crystalline states of P(VDF‐TrFE) films by molecular dynamics simulations

Multi-functional attributes of rare earth double doped SrBi₂Nb₂O₉ ferroelectric system

Finsler geometry modeling and Monte Carlo study of skyrmion shape deformation by uniaxial stress

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Electromechanical properties of ferroelectric polymers: Finsler geometry modeling and a Monte Carlo study

Cited by 3 publications

References 21 publications

Disclosing the dependencies of ferroelectric and piezoelectric performances on crystalline states of P(VDF‐TrFE) films by molecular dynamics simulations

Disclosing the dependencies of ferroelectric and piezoelectric performances on crystalline states of P(VDF‐TrFE) films by molecular dynamics simulations

Multi-functional attributes of rare earth double doped SrBi2Nb2O9 ferroelectric system

Finsler geometry modeling and Monte Carlo study of skyrmion shape deformation by uniaxial stress

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Product

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Multi-functional attributes of rare earth double doped SrBi₂Nb₂O₉ ferroelectric system