Depolarizing field in ultrathin electrocalorics

Глазкова, Е. А.; Chang, C.-M.; Lisenkov, S.; Mani, B. K.; Ponomareva, I.

doi:10.1103/physrevb.92.064101

Cited by 10 publications

(4 citation statements)

References 33 publications

(42 reference statements)

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“…The lowest E ME in Fig. 4b at coordinates 0.25 and 0.75 imply the largest magnetoelectric coupling during the switching, consistent with the fact that the very large response at the critical point of phase transition (the electrocaloric effect at Curie temperature [56][57][58][59][60][61] , the piezoelectric effect at morphotropic phase boundaries 62,63 and so on). The phenomenon of ferromagnetism in CrGe 2 Se 3 being switched by 180°by switching polarization under an electric field is also found in CrSn 2 Se 3 (see Supplementary Fig.…”

Section: Rotational Magnetoelectric Switching In 2d Crx 2 Sesupporting

confidence: 68%

Rotational magnetoelectric switching in orthorhombic multiferroics

Li,

Tian,

Chen

et al. 2024

npj Comput Mater

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Controlling the direction of ferromagnetism and antiferromagnetism by an electric field in single-phase multiferroics will open the door to the next generation of devices for spintronics and electronics. The typical magnetoelectric coupling such as the linear magnetoelectric effect is very weak in type-I multiferroics and therefore the magnetoelectric switching is rarely achieved. Here, using first-principles simulations, we propose a magnetoelectric switching mechanism to achieve such highly desired control in orthorhombic multiferroics. One class of two-dimensional proper multiferroics (CrX2Se3 and MnX2Te3, X = Sn, Ge) and perovskite multiferroics (EuTiO3 and BiFeO3/LaFeO3 superlattice) are taken as examples to show the mechanism. In the ferroelectric switching process, the proper polarization rotates its direction by 180° and keeps its magnitude almost unchanged, the ferromagnetic or antiferromagnetic vector is rotationally switched by 180° following the rotation of ferroelectric polarization. This rotational magnetoelectric switching results from in-plane structural anisotropy and magnetic anisotropy, and the process of switching is governed by cosine functions from the phenomenological Landau-type models. This study addresses the challenge of magnetoelectric switching in type-I multiferroics by proposing a general magnetoelectric switching mechanism.

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Section: Rotational Magnetoelectric Switching In 2d Crx 2 Sesupporting

confidence: 68%

Rotational magnetoelectric switching in orthorhombic multiferroics

Li,

Tian,

Chen

et al. 2024

npj Comput Mater

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“…Moreover, Glazkova et al revealed a positive effect of residual depolarizing field on the electrocaloric effect, which is attributed to formation of nanodomain in ultrathin ferroelectric thin films. 122 Also note that the strict Maxwell relation in calculating DT originating from these two different relations was unknown since it was not explicitly discussed in these works (Refs. 17, 55, and 123 and references therein].…”

Section: G Depolarizing Fieldmentioning

confidence: 99%

Direct and indirect measurements on electrocaloric effect: Recent developments and perspectives

Liu

Scott

Dkhil

2016

Applied Physics Reviews

232

150

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It has been ten years since the discovery of the giant electrocaloric effect in ferroelectric materials showed that it is possible to employ this effect for substantial cooling applications. This last decade has been marked by increasing research interest, especially in characterizing and measuring the electrocaloric effect using both the so-called indirect and direct approaches. In this context, a comprehensive summary and careful reexamination of these approaches are very timely and of great importance to justify the assumptions used in different measurement techniques. This review is therefore dedicated to cover recent important and rapid advances from both the indirect and direct measurements and provides critical insights relevant for quantifying the electrocaloric effect. It involves electrocaloric materials from normal ferroelectrics, antiferroelectrics, and relaxors, and it fundamentally focuses on how the electrocaloric entropy changes in response to electric field in these typical electrocalorics. The article addresses recent developments, especially during the past three years, such as technical selection of proper polarization-electric field loops, negative electrocaloric effect in antiferroelectrics and relaxors, the controversial debate on the indirect method in relaxors, the important role of field dependence of specific heat, kinetic factors, and so on. Moreover, this review also is concerned with extracting reliable data by direct measurements. Four typical techniques and devices used recently, such as thermocouples, differential scanning calorimeters, specifically designed calorimeters, and scanning thermal microscopy, are briefly reviewed, while infrared cameras are emphasized. We hope that our review will not only provide a useful background to understand fundamentally the electrocaloric effect and what one really measures but also may act as a practical guide to exploit and develop electrocalorics towards the design of suitable devices. Published by AIP Publishing. [http://dx

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“…So far, additional extrinsic contributions to the temperature change by DWs have been reported at the transition between different multi-and single-domain states in strained films [16][17][18][19], in the presence of depolarization [20] or originating from complex polar vortex ordering within superlattices [21]. Furthermore, improved caloric responses coming from DWs themselves have been predicted, including positive and negative EC temperature changes at each side of the wall [22], enhancement of the adiabatic temperature change ∆T with the density and width of immobile elastic walls [23] and the enhancement of the EC on Bloch-like walls [24].…”

Section: Introductionmentioning

confidence: 99%

“…In particular, wall motion has often been neglected. This, however, is particularly relevant, because it is known that field-induced switching by DW motion is related to irreversible heat losses [20,25,26].…”

Section: Introductionmentioning

confidence: 99%

Influence of domain walls and defects on the electrocaloric effect

2023

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The electrocaloric (EC) effect is the adiabatic temperature change of a material in a varying external electrical field which is promising for novel cooling devices. While the fundamental understanding of the caloric response of defect-free materials is well progressed, there are important gaps in knowledge on reversibility and time-stability of the response. Particularly, it is not settled how the time-dependent elements of microstructure which are always present in real materials act on the field- induced temperature changes. Ab initio based molecular dynamics simulations allow us to isolate and understand the effects arising from domain walls and defect dipoles and study their interplay. We show that domain walls in cycling fields do not improve the response in either one ferroelectric phase or at the ferroelectric phase transition but may result in irreversible heat losses. The presence of defect dipoles may be beneficial for the EC response for proper field protocols, and interestingly this benefit is not too sensitive to the defect configuration.

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Depolarizing field in ultrathin electrocalorics

Cited by 10 publications

References 33 publications

Rotational magnetoelectric switching in orthorhombic multiferroics

Rotational magnetoelectric switching in orthorhombic multiferroics

Direct and indirect measurements on electrocaloric effect: Recent developments and perspectives

Influence of domain walls and defects on the electrocaloric effect

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