Ultrafast Ferroelectric Domain Switching Induced by Nano‐Second Strain‐Pulse

Shi, Xiaoming; Wang, Jing; Cheng, Xingwang; Huang, Houbing

doi:10.1002/adts.202100345

Cited by 13 publications

(10 citation statements)

References 37 publications

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“…where c ijkl is the elastic stiffness constant, e ij is the elastic strain, 𝜖 ij is the total strain, and 𝜀 0 ij is the eigenstrain. The electrostatic energy density can be written as [36]…”

Section: Methodsmentioning

confidence: 99%

Strain Engineering of Energy Storage Performance in Relaxor Ferroelectric Thin Film Capacitors

Shi

Pan

et al. 2022

Advcd Theory and Sims

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Dielectric energy storage capacitors are receiving a great deal of attention owing to their high energy density and fast charging-discharging speed. The current energy storage density of dielectrics is relatively low and cannot meet the requirements of miniaturization of pulsed power equipment. Therefore, increasing the energy storage density of dielectrics has become a research hotspot. Herein, using phase-field simulations to design polymorphic nanodomains, the strain engineering of energy storage performance of binary and ternary solid solution relaxor ferroelectric films is investigated. The results show that the energy storage performance of the ternary film is better than that of the binary film due to the polymorphic nanodomains. In addition, as the film in-plane strain is modified from −2% to 2%, the energy density is improved by 80%, and the efficiency also increases from 52% to 77%. This work proves the remarkable energy storage performance of polymorphic films and provides a theoretical basis to optimize the energy-storage performance of ferroelectric thin-film capacitors by adjusting the misfit strain.

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Section: Methodsmentioning

confidence: 99%

Strain Engineering of Energy Storage Performance in Relaxor Ferroelectric Thin Film Capacitors

Shi

Pan

et al. 2022

Advcd Theory and Sims

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“…Landau–Devonshire theory is widely used to study the caloric effect of monocrystalline ferroelectric materials. [ 45–49 ] From Liu et al's article, the total thermodynamic free energy density consists of the Landau energy density and the elastic energy density. [ 23 ] And we just consider the stress applied in the Z direction ( σ 1 = σ 2 = σ 4 = σ 5 = σ 6 = 0, σ 3 ≠ 0), so the final free energy density expression is

G_{Total} = α_{1} false(P_{1}^{2} + P_{2}^{2} + P_{3}^{2} false) + α_{11} false(P_{1}^{4} + P_{2}^{4} + P_{3}^{4} false) + α_{12} false(P_{1}^{2} P_{2}^{2} + P_{1}^{2} P_{3}^{2} + P_{2}^{2} P_{3}^{2} false) + α_{111} false(P_{1}^{6} + P_{2}^{6} + P_{3}^{6} false) + α_{112} false[P_{1}^{2} false(P_{2}^{4} + P_{3}^{4} false) + P_{2}^{4} false(P_{1}^{4} + P_{3}^{4} false) + P_{3}^{4} false(P_{1}^{4} + P_{2}^{4} false) false] + α_{123} P_{1}^{2} P_{2}^{2} P_{3}^{2} + α_{1111} false(P_{1}^{8} + P_{2}^{8} + P_{3}^{8} false) + α_{1122} false(P_{1}^{4} P_{2}^{4} + P_{1}^{4} P_{3}^{4} + P_{2}^{4} P_{3}^{4} false) + α_{1112} false[P_{1}^{6} false(P_{2}^{2} + P_{3}^{2}

…”

Section: Methodsmentioning

confidence: 99%

“…Landau-Devonshire theory is widely used to study the caloric effect of monocrystalline ferroelectric materials. [45][46][47][48][49] From Liu et al's article, the total thermodynamic free energy density consists of the Landau energy density and the elastic energy density. [23] And we just consider the stress applied in the Z direction (σ 1 ¼ σ 2 ¼ σ 4 ¼ σ 5 ¼ σ 6 ¼ 0, σ 3 6 ¼ 0), so the final free energy density expression is…”

Section: Methodsmentioning

confidence: 99%

Enhancing the Elastocaloric Strength by Combining Positive and Negative Elastocaloric Effects

Zhu

Shi

Gao

et al. 2022

Physica Rapid Research Ltrs

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Solid‐state refrigeration has received widespread attention recently because of its high refrigeration efficiency and environmental protection. Compared with other solid‐state refrigeration technologies, elastocaloric effects have great application potential. However, the current temperature change of elastocaloric effects is still low. This work explores the change law of phase transition temperature of ferroelectric materials by applying the external stress based on the thermodynamic calculation. It can be found that ferroelectric materials’ positive and negative elastocaloric effects can peak at the same temperature, so here a device to combine the positive and negative elastocaloric effects of Ba0.7Sr0.3TiO3 and BaZr0.015Ti0.085O3 is designed. This device can achieve a ΔT of 3.18 K near room temperature under applied stress of 200 MPa, which is twice as large as that of 1.4 K in BCZTO‐Fe under the same stress condition. And it can be raised to 4.1 K after applying an electric field of 10 MV m−1. It is the first time to combine positive and negative elastocaloric effects to achieve high cooling near room temperature, which provides a new solution for efficient cooling near room temperature.

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“…In the phase-field model [33][34][35][36][37], the spatial distribution of the magnetization field M = Msm = Ms(m1, m2, m3) is used to describe the domain structure, where Ms and m are the saturation magnetization and the components of unit magnetization vector, respectively. The transient magnetization domain structure is described by the Landau-Lifshitz-Gilbert (LLG) equation:…”

mentioning

confidence: 99%

“…The simulation in this work uses FeGa alloy and Co20Fe60B20 as model systems to study the strain effect on the magnetic domains with different domain walls types. The materials parameters for ultrathin Co20Fe60B20 used in simulations are listed as follows [24,[35][36][37][38]: Aex = 1.9 × 10 -11 J/m, K1 = 196 GPa, c12 = 156 GPa. In the present simulations, the elastic stiffness tensor for the ferroelectric substrate is set as the same as that of the magnetic island, i.e., cp = cisland for simplicity.…”

mentioning

confidence: 99%