Orientations of low-energy domain walls in perovskites with oxygen octahedral tilts

Xue, Fei; Gu, Yijia; Liang, Linyun; Wang, Yi; Chen, Lei

doi:10.1103/physrevb.90.220101

Cited by 40 publications

(39 citation statements)

References 30 publications

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“…Based on the analyses above, we can conclude that the tilt gradient energy would greatly influence the AFD-FE coupling at domain walls, and induce peculiar AFD-FE wall morphology according to different kinds of domain walls. Since the oxygen octahedra are reported to be strongly coupled with the electronic, magnetic and optical properties 14,15 , we asume that the different morphorlogy induced by tilt gradient changes may corresponds to the specific functionalities according to each DW.…”

Section: Discussionmentioning

confidence: 90%

“…Surprisingly, all these physical mechanisms and properties can be traced to the changes of the fundamental unit in transition metal oxides with an ABO 3 perovskite structure -the BO 6 octahedra. The arrangements or symmetry of the corner-sharing octahedral network in perovskites are reported to be strongly coupled with the electronic, magnetic and optical properties 14,15 . Investigations on the AFD characteristics and the coupling of AFD, FE and FM order parameters at domain walls would help us better understand the structure of the walls, permit in the explanation of wall multiferroicity in terms of their underlying structure and make it more accessible to control the specific functionalities.…”

Section: Introductionmentioning

confidence: 99%

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Mapping gradient-driven morphological phase transition at the conductive domain walls of strained multiferroic films

et al. 2019

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The coupling between antiferrodistortion (AFD) and ferroelectric (FE) polarization, universal for all tilted perovskite multiferroics, is known to strongly correlate with domain wall functionalities in the materials. The intrinsic mechanisms of domain wall phenomena, especially AFD-FE coupling-induced phenomena at the domain walls, have continued to intrigue the scientific and technological communities because of the need to develop the future nano-scale electronic devices. Over the past years, theoretical studies often show controversial results, owing to the fact that they are neither sufficiently nor directly corroborated with experimental evidences. In this work, the AFD-FE coupling at uncharged 180° and 71° domain walls in BiFeO 3 films are investigated by means of aberration-corrected scanning transmission electron microscopy with high resolution (HR-STEM) and rationalized by phenomenological Landau-Ginsburg-Devonshire (LGD) theory. We reveal a peculiar morphology at the AFD-FE walls, including kinks, meandering, triangle-like regions with opposite oxygen displacements and curvature near the interface. The LGD theory confirms that the tilt gradient energy induces these unusual morphology and the features would change delicately with different kinds of domain walls. Moreover, the 180° AFD-FE walls are proved to be conductive with an unexpected reduction of Fe-O-Fe bond angle, which is distinct from theoretical predictions. By exploring AFD-FE coupling at domain walls and its induced functionalities, we provide exciting evidences into the links between structural distortions and its electronic properties, which benefit a lot for fundamental understanding for domain wall functionalities as well as functional manipulations for novel nano-devices.

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Section: Discussionmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Mapping gradient-driven morphological phase transition at the conductive domain walls of strained multiferroic films

et al. 2019

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“…5 , we argue that those ‘B-boundaries' are either APBs or FE t DWs, so APBs and FE t DWs tend to be <100> T -oriented. Contrarily, FE r DWs show wavy features with no preferred orientation, because of the so-called ‘rotational compatibility conditions' 38 . The role of ‘B-boundaries' is further discussed in Supplementary Fig.…”

Section: Methodsmentioning

confidence: 99%

Domain topology and domain switching kinetics in a hybrid improper ferroelectric

et al. 2016

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Charged polar interfaces such as charged ferroelectric walls or heterostructured interfaces of ZnO/(Zn,Mg)O and LaAlO3/SrTiO3, across which the normal component of electric polarization changes suddenly, can host large two-dimensional conduction. Charged ferroelectric walls, which are energetically unfavourable in general, were found to be mysteriously abundant in hybrid improper ferroelectric (Ca,Sr)3Ti2O7 crystals. From the exploration of antiphase boundaries in bilayer-perovskites, here we discover that each of four polarization-direction states is degenerate with two antiphase domains, and these eight structural variants form a Z4 × Z2 domain structure with Z3 vortices and five distinct types of domain walls, whose topology is directly relevant to the presence of abundant charged walls. We also discover a zipper-like nature of antiphase boundaries, which are the reversible creation/annihilation centres of pairs of two types of ferroelectric walls (and also Z3-vortex pairs) in 90° and 180° polarization switching. Our results demonstrate the unexpectedly rich nature of hybrid improper ferroelectricity.

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“…[45] and then confirmed in Refs. [44,46,49,50]. The coupling between ferroelectricity and magnetism is also mainly determined by these octahedral rotation patterns, as we later explain in Section 4.…”

Section: Review @ Rrlmentioning

confidence: 96%

Interplay between elasticity, ferroelectricity and magnetism at the domain walls of bismuth ferrite

Gareeva

Diéguez

Íñiguez

et al. 2015

Phys. Status Solidi RRL

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Multiferroic domain walls have recently been proposed as the active element in devices related to spintronics, data storage, and magnetic logic. Among multiferroics, BiFeO3 is by far the most studied material. Its domain walls have shown rich behaviours that include conductivity in an otherwise insulating crystal, and magnetotransport properties that are markedly different from those of the bulk. In this article we summarize the experimental evidence and the current models used to understand the interplay between elastic, electric, and magnetic properties of the domain walls. Starting from the considera‐ tion of antiferromagnetic domain structures on a background of ferroelectric domains, and emphasizing pinning effects, we proceed to discuss the microscopic behavior of ferroelectricity and magnetism at the walls. We describe how domain organization in BiFeO3 is caused by structural transformations, and scrutinize modelling works pinpointing their characteristic features. Finally, we summarize the recent progress and list open questions for future study on BiFeO3 domain structures. (© 2016 WILEY‐VCH Verlag GmbH &Co. KGaA, Weinheim)

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Orientations of low-energy domain walls in perovskites with oxygen octahedral tilts

Cited by 40 publications

References 30 publications

Mapping gradient-driven morphological phase transition at the conductive domain walls of strained multiferroic films

Mapping gradient-driven morphological phase transition at the conductive domain walls of strained multiferroic films

Domain topology and domain switching kinetics in a hybrid improper ferroelectric

Interplay between elasticity, ferroelectricity and magnetism at the domain walls of bismuth ferrite

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