Bistability of ferroelectric domain walls: Morphotropic boundary and strain effects

Yudin, P. V.; Tagantsev, A. K.; Setter, N.

doi:10.1103/physrevb.88.024102

Cited by 13 publications

(9 citation statements)

References 20 publications

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“…This enables the development of ferroelectricity in the domain walls of nonferroelectric STO 39,42 , for example. In this scenario, a gradient of the order parameter exists in the walls, and gradient-gradient coupling between order parameters or with strain, can occur [43][44][45] . Lateral movement of domain walls in ferroelastics, more generally, can take place by movement of ledges along the walls 46,47 .…”

Section: Extrinsic Charactermentioning

confidence: 99%

Magnetic field andin situstress dependence of elastic behavior inEuTiO3from resonant ultrasound spectroscopy

et al. 2016

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Magneto-electric coupling phenomena in EuTiO3 are of considerable fundamental interest and are also understood to be key to reported multiferroic behavior in strained films, which exhibit distinctly different properties to the bulk. Here the magneto-elastic coupling of EuTiO3 is investigated by resonant ultrasound spectroscopy with in-situ applied magnetic field and stress as a function of temperature ranging from temperatures above the structural transition temperature, T s , to below the antiferromagnetic ordering temperature T n. One single crystal and two polycrystalline samples are investigated and compared to each other. Both paramagnetic and diamagnetic transducer carriers are used, allowing an examination of the effect of both stress and magnetic field on the behaviour of the sample. The properties are reported in constant field/variable temperature and in constant temperature/variable field mode where substantial differences between both data sets are observed. In addition, elastic and magnetic poling at high fields and stresses at low temperature has been performed in order to trace the history dependence of the elastic constants. Four different temperature regions are identified, characterized by unusual elastic responses. The low temperature phase diagram has been explored and found to exhibit rich complexity. The data evidence a considerable relaxation of elastic constants at high temperatures, but with little effect from magnetic field alone above 20 K, in addition to the known low temperature coupling.

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Section: Extrinsic Charactermentioning

confidence: 99%

Magnetic field andin situstress dependence of elastic behavior inEuTiO3from resonant ultrasound spectroscopy

et al. 2016

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“…Ferroelectric materials change domain structures but only 90 boundaries carry sufficient strain to generate AE, while the strain involved in 180 boundaries is much weaker. [23][24][25][26] Detailed computer simulations of AE in ferroelectrics have shown that most nano-structural changes in ferroic materials contain too little elastic energy to generate measurable AE signals. 27 This result also questions the way we analyze AE in ferroic materials: Visible AE events are due to a complex combination of a multitude of various domain boundary movements over a very short time interval (large jerks) and it is virtually impossible to distinguish between individual events.…”

Section: )mentioning

confidence: 99%

Acoustic emission during the ferroelectric transition Pm3¯m to P4mm in BaTiO3 and the ferroelastic transition R3¯m-C2/c in Pb3(PO4)2

Salje

Dul’kin

Roth

2015

Applied Physics Letters

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Acoustic emission (AE) spectroscopy without frequency filtering (∼broadband AE) and moderate time integration is shown to be sensitive enough to allow the investigation of subtle nano-structural changes in ferroelectric BaTiO3 and ferroelastic Pb3(PO4)2. AE signals during weak phase transitions are compatible with avalanche statistics as observed previously in large-strain systems. While the data are too sparse to determine avalanche exponents, they are well suited to determine other thermodynamic parameters such as transition temperatures and critical stresses.

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“…2ab) show a clear indication of the characteristic double-kink in the normal (Néel) component of the polarization (P s ). It is worth noting that in some high-symmetry domains walls, [35][36][37] such double kinks on P s or P t appear only after considering flexoelectric [34] coupling terms, while here, in the case of the [211]-oriented Bloch (bistable [38]) wall, the flexoelectric coupling has actually only a negligible influence on the domain wall profile [15,16]. In either case, the amplitude of these double-kinks (about one percent of the spontaneous polarization) is much smaller than the magnitude of the P s oscillations of Fig.…”

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confidence: 99%

Ising lines: Natural topological defects within ferroelectric Bloch walls

2015

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Phase-field simulations demonstrate that the polarization order-parameter field in the GinzburgLandau-Devonshire model of rhombohedral ferroelectric BaTiO3 allows for an interesting linear defect, stable under simple periodic boundary conditions. This linear defect, termed here as Ising line, can be described as about 2 nm thick intrinsic paraelectric nanorod acting as a highly mobile borderline between finite portions of Bloch-like domain walls of the opposite helicity. These Ising lines play the role of domain boundaries associated with the Ising-to-Bloch domain wall phase transition.PACS numbers: 77.80.Dj, Perovskite ferroelectrics are the key materials in the current ferroelectric research and a considerable effort was recently devoted to the investigations of their domain structure and their domain wall properties. Much less is known about ferroelectric line defects, although this topic is also gaining attention [1-5, 7-11, 33], for example, in relation to magnetic vortices and skyrmions [1,2]. Ferroelecric domains and line defects may be inspiring in other research areas, too, for example in the particle physics [12].One of the most intriguing recent result in this field is the prediction of so-called Bloch-like domain walls in BaTiO 3 and PbTiO 3 , based on Ginzburg-LandauDevonshire model [13][14][15][16] and first-principles calculations [17,18]. Previously, we and others studied [211]-oriented 180-degree domain walls in the rhombohedral BaTiO 3 , separating domains with spontaneous polarization parallel and antiparallel to [111] (as usual we refer to the cubic axes of the parent paraelectric phase of BaTiO 3 , see Fig. 1 a). Calculations carried out within the Ginzburg-Landau-Devonshire model of Refs. 19,20 suggest that this domain wall has a Bloch-like (bistable and chiral) structure [13,16]. At the same time, it has been shown that this ([211]-oriented) Bloch-like wall can be transformed to an achiral, Ising-like domain wall by a moderate uniaxial stress [15]. The transformation proceeds as a continuous, symmetry-breaking phase transition associated with the divergence of dielectric permittivity [21] and with disappearance of the polarization P DW within the domain wall interior [15]. The internal domain wall polarization P DW , existing only up to the Bloch-to-Ising transition point, is parallel or antiparallel to [011] direction. It is natural to ask whether the antiparallel P DW states could coexist within the same domain wall plane, similarly as the ferroelectric domains may coexist in the bulk of ferroelectric crystal [16,[22][23][24].In our previous work [15] we have studied the case when the P DW vector has an opposite orientation within neighboring domain walls, as indicated in Fig. 1 b. Such domain structure contains only the domain walls of the same helicity and it is thus a chiral structure as a whole. In contrast, in the present work we have explored a racemic domain structure, which contains an equal amount of left-handed and right-handed areas on average as well as within each domain wa...

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Bistability of ferroelectric domain walls: Morphotropic boundary and strain effects

Cited by 13 publications

References 20 publications

Magnetic field andin situstress dependence of elastic behavior inEuTiO3from resonant ultrasound spectroscopy

Magnetic field andin situstress dependence of elastic behavior inEuTiO3from resonant ultrasound spectroscopy

Acoustic emission during the ferroelectric transition Pm3¯m to P4mm in BaTiO3 and the ferroelastic transition R3¯m-C2/c in Pb3(PO4)2

Ising lines: Natural topological defects within ferroelectric Bloch walls

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