Room-temperature multiferroic magnetoelectrics

Scott, J. F.

doi:10.1038/am.2013.58

Cited by 250 publications

(163 citation statements)

References 84 publications

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“…Ferroelectrics are a very important family of functional materials, and they have received attention from a variety of fields, including material science, condensed matter physics and electric engineering [1][2][3][4][5][6][7][8] . Applications of ferroelectric materials are primarily governed by their polarization response to external stimuli.…”

Section: Introductionmentioning

confidence: 99%

Electric-field-induced phase transition and pinched P–E hysteresis loops in Pb-free ferroelectrics with a tungsten bronze structure

Zhu

Liu

et al. 2018

NPG Asia Mater

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Antiferroelectrics are of interest due to their high potential for energy storage. Here, we report the discovery of pinched, polarization-vs.-electric field (P-E) hysteresis loops in the lead-free tungsten bronze ferroelectrics Ba 4 Sm 2 Ti 4 Nb 6 O 30 and Ba 4 Eu 2 Ti 4 Nb 6 O 30 , while a broad, single P-E hysteresis loop was observed in the analogue compound Ba 4 Nd 2 Ti 4 Nb 6 O 30 . Pinched P-E loops are similar to antiferroelectric hysteresis loops, but in perovskites, they are mostly caused by an extrinsic, internal bias field due to defects, which block domain wall motion. We show that the pinched P-E loops are caused by an intrinsic effect, i.e., by the electric-field-induced phase transition from a nonpolar incommensurate to a polar commensurately modulated crystal structure. The in situ electron diffraction results show the coexistence of commensurate polar structural modulation and incommensurate non-polar modulation during the ferroelectric transition and within the ferroelectric phase below the transition temperature. This phase coexistence is the reason for the small remanent polarization. An external electric field transforms the incommensurate component into a commensurate one, and the polarization increases. This new mechanism for pinched P-E hysteresis loops in ferroelectrics not only indicates a new direction for the development of Pb-free ferroelectric materials for energy storage but also significantly contributes to the physical understanding of ferroelectricity in materials with a tungsten bronze structure.

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Section: Introductionmentioning

confidence: 99%

Electric-field-induced phase transition and pinched P–E hysteresis loops in Pb-free ferroelectrics with a tungsten bronze structure

Zhu

Liu

et al. 2018

NPG Asia Mater

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“…Perovskite is one of the most important material systems for multiferroic study. Since the discovery of multiferroic behaviors in perovskite BiFeO 3 and TbMnO 3 [2,3], a large number of multiferroic materials with different physical mechanisms have been found in the last decade [9][10][11][12][13]. Among them, the spin-induced multiferroics have received the most attention because the ferroelectricity is induced by magnetic structures so that a strong ME coupling would be expected [14][15][16].…”

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confidence: 99%

Observation of Magnetoelectric Multiferroicity in a Cubic Perovskite System:LaMn3Cr4O12

et al. 2015

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The magnetoelectric multiferroicity is not expected to occur in a cubic perovskite system due to the high structural symmetry. By versatile measurements in magnetization, dielectric constant, electric polarization, neutron and X-ray diffraction, Raman scattering as well as theoretical calculations, we reveal that the A-site ordered perovskite LaMn 3 Cr 4 O 12 with cubic symmetry is a novel spin-driven multiferroic system with strong magnetoelectric coupling effects. When magnetic field is applied in parallel/perpendicular to electric field, the ferroelectric polarization can be enhanced/suppressed significantly. The unique multiferroic phenomenon observed in this cubic perovskite cannot be understood by conventional spin-driven microscopic mechanisms. Instead, a nontrivial effect involving the interactions between two magnetic sublattices is likely to play a crucial role. 3The magnetoelectric (ME) multiferroicity with coupled ferroelectric and magnetic orders have received much attention due to their great potential for numerous applications [1][2][3][4][5][6][7][8]. Perovskite is one of the most important material systems for multiferroic study. Since the discovery of multiferroic behaviors in perovskite BiFeO 3 and TbMnO 3 [2,3], a large number of multiferroic materials with different physical mechanisms have been found in the last decade [9][10][11][12][13]. Among them, the spin-induced multiferroics have received the most attention because the ferroelectricity is induced by magnetic structures so that a strong ME coupling would be expected [14][15][16]. Several theories such as spin-current model (or inverse Dzyaloshinskii-Moriya interaction), exchange striction mechanism and d-p hybridization mechanism have been proposed to account for the spin-induced ferroelectricity in ME multiferroics by special spin textures such as non-collinear spiral spin structures and collinear E-type antiferromagnetic (AFM) structure with zigzag spin chains [17][18][19][20][21]. It is well known that a cubic perovskite lattice is unfavorable for ferroelectricity due to the existence of an inversion center. However, the total symmetry for an ME multiferroics is the product of the crystal and magnetic symmetries. Therefore, in principle, it is possible to find an ME multiferroics in a cubic perovskite system if its magnetic structure breaks the space inversion symmetry. Nevertheless, such an intriguing case has never been found in previous studies. 4The A-site ordered perovskite with a chemical formula of AA′ 3 B 4 O 12 provides an opportunity for searching ME multiferroics in a cubic lattice.This type of ordered perovskite can be formed when three quarters of the A-site of a simple ABO 3 perovskite is substituted by a transition-metal ion A′ (Fig. 1a) [22]. Since both A′ and B sites accommodate magnetic transition-metal ions, multiple magnetic interactions may develop while the crystal structure can be finely tuned by selecting appropriate A′ and B elements to maintain a cubic lattice [23][24][25][26][27]. In this lette...

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“…Conceptually, the ECE is somewhat harder to grasp than the PE, but it is analogous to the changes in temperature and entropy that occur when a gas is compressed or in a rubber band when it is stretched. The entropy and corresponding temperature changes are due to the relative movement of the ions in the structure under the applied field and, hence, changes in order.Over the past 10 years, there has been a considerable upsurge of interest in the technological applications of the PE for the recovery of electrical energy from waste heat 4 (to power autonomous sensors or improve the overall efficiency of combustion engines, for example) and of the ECE in new cooling systems 5,6 (to eliminate the use of liquid refrigerants). The two effects are intimately related.…”

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confidence: 99%

“…Over the past 10 years, there has been a considerable upsurge of interest in the technological applications of the PE for the recovery of electrical energy from waste heat 4 (to power autonomous sensors or improve the overall efficiency of combustion engines, for example) and of the ECE in new cooling systems 5,6 (to eliminate the use of liquid refrigerants). The two effects are intimately related.…”

mentioning

confidence: 99%

Next-generation electrocaloric and pyroelectric materials for solid-state electrothermal energy interconversion

Mantese²,

et al. 2014

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Thin-film electrocaloric and pyroelectric electrothermal interconversion energy sources have recently emerged as viable means for primary and auxiliary solid-state cooling and power generation. Two significant advances have facilitated this development: (1) the formation of high-quality polymeric and ceramic thin films with figures of merit that project system-level performance as a large percentage of Carnot efficiency and (2) the ability of these newer materials to support larger electric fields, thereby permitting operation at higher voltages.This makes the power electronic architectures more favorable for thermal to electric interconversion. Current research targets to adequately address commercial device needs include reduction of parasitic losses, increases in mechanical robustness, and the ability to form nearly free-standing elements with thicknesses in the range of 1-10 m. This article describes the current state-ofthe-art materials, thermodynamic cycles, and device losses and points toward potential lines of research that would lead to substantially better figures of merit for electrothermal interconversion.Keywords: Material type-polymer (143), Material type-ceramic (121), Functionality-energy generation (189), , Material form-film (231), Transport-ferroelectricity (288) Fundamentals of ferroelectrics materials: Pyroelectrics and ElectrocaloricsIt has long been known that, when heated, materials such as the borosilicate tourmaline have the ability to attract objects such as pieces of feather, pollen, and cloth. This is due to the appearance of a surface charge in response to a temperature change. The history of this phenomenon, which is known as the pyroelectric effect (PE), was charted by Lang, 1 from its first description by Dielectrics whose structures possess both a unique axis of symmetry and lack a center of symmetry (i.e., that are "polar") display a spontaneous polarization (PS) and will exhibit a PE due to temperature-induced changes in PS. MRS BulletinThese variations in PS result in uncompensated charge appearing along surfaces that have a component normal to the polar axis, generating a net voltage across the dielectric. If the surfaces are provided with electrodes that are connected through an external circuit, this surface charge can cause a current to flow, potentially resulting in useful work. In the absence of an applied electric field or applied stress, the pyroelectric coefficient p(T) is defined as the rate of change of spontaneous polarization with temperature such that p(T) = dPS/dT. If electrodes are applied to the major faces perpendicular to the polar axis, as illustrated in Figure 1a, and the temperature is changed at a rate dT/dt, then the short-circuitThe converse of the pyroelectric effect is called the electrocaloric effect (ECE; see Figure 1b). Here, an electric field applied to a polar dielectric causes a change in temperature in the material. Conceptually, the ECE is somewhat harder to grasp than the PE, but it is analogous to the changes in temperature and en...

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Room-temperature multiferroic magnetoelectrics

Cited by 250 publications

References 84 publications

Electric-field-induced phase transition and pinched P–E hysteresis loops in Pb-free ferroelectrics with a tungsten bronze structure

Electric-field-induced phase transition and pinched P–E hysteresis loops in Pb-free ferroelectrics with a tungsten bronze structure

Observation of Magnetoelectric Multiferroicity in a Cubic Perovskite System:LaMn3Cr4O12

Next-generation electrocaloric and pyroelectric materials for solid-state electrothermal energy interconversion

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