Effects of the surface charge screening and temperature on the vortex domain patterns of ferroelectric nanodots

Wu, Chong; Chen, W. J.; Woo, C.H.; Zheng, Yue

doi:10.1063/1.4766382

Cited by 15 publications

(9 citation statements)

References 54 publications

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“…For this domain pattern, the three components of the toroidal moment are almost equal with each other, i.e., | g x | ≈ | g y | ≈ | g z |. From the morphologies of equilibrium domain pattern in Figure 2a , we can see that this domain pattern actually has a single vortex with its toroidal axis along the <111> direction, in consistent with the prediction of a rhombohedral vortex domain pattern by previous works 27 33 . As the temperature further decreases, this rhombohedral vortex domain pattern keeps stable with its toroidal moment increasing gradually.…”

Section: Resultssupporting

confidence: 89%

“…It has been demonstrated that the domain structure in ferroelectrics could be dramatically changed by electric field, mechanical field and temperature, etc., which forms the base of domain and domain wall applications 6 7 19 31 32 33 34 35 36 . It would be much instructive for the application of VDS in ferroelectrics if the mechanisms of its formation and transformation are understood.…”

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confidence: 99%

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Controllability of Vortex Domain Structure in Ferroelectric Nanodot: Fruitful Domain Patterns and Transformation Paths

Chen

Zheng

et al. 2014

Sci Rep

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Ferroelectric vortex domain structure which exists in low-dimensional ferroelectrics is being intensively researched for future applications in functional nanodevices. Here we demonstrate that adjusting surface charge screening in combination with temperature can provide an efficient way to gain control of vortex domain structure in ferroelectric nanodot. Systematical simulating experiments have been conducted to reveal the stability and evolution mechanisms of domain structure in ferroelectric nanodot under various conditions, including processes of cooling-down/heating-up under different surface charge screening conditions, and increasing/decreasing surface charge screening at different temperatures. Fruitful phase diagrams as functions of surface screening and temperature are presented, together with evolution paths of various domain patterns. Calculations discover up to 25 different kinds of domain patterns and 22 typical evolution paths of phase transitions. The fruitful controllability of vortex domain structure by surface charge screening in combination with temperature should shed light on prospective nanodevice applications of low-dimensional ferroelectric nanostructures.

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Section: Resultssupporting

confidence: 89%

mentioning

confidence: 99%

Controllability of Vortex Domain Structure in Ferroelectric Nanodot: Fruitful Domain Patterns and Transformation Paths

Chen

Zheng

et al. 2014

Sci Rep

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“…Su et al [456] revealed the effect of intrinsic surface stress on vortex formation in ferroelectric nanoparticles. The screening charge effect on the domain structure in ferroelectric nanodots and short nanotubes has also been revealed [457][458][459][460]. Simulation results show that domain structures are highly dependent on the compensation of polarization-induced surface charges.…”

Section: Formation Of Ferroelectric Vorticesmentioning

confidence: 91%

Characteristics and controllability of vortices in ferromagnetics, ferroelectrics, and multiferroics

Zheng

Chen

2017

Rep. Prog. Phys.

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Topological defects in condensed matter are attracting e significant attention due to their important role in phase transition and their fascinating characteristics. Among the various types of matter, ferroics which possess a switchable physical characteristic and form domain structure are ideal systems to form topological defects. In particular, a special class of topological defects-vortices-have been found to commonly exist in ferroics. They often manifest themselves as singular regions where domains merge in large systems, or stabilize as novel order states instead of forming domain structures in small enough systems. Understanding the characteristics and controllability of vortices in ferroics can provide us with deeper insight into the phase transition of condensed matter and also exciting opportunities in designing novel functional devices such as nano-memories, sensors, and transducers based on topological defects. In this review, we summarize the recent experimental and theoretical progress in ferroic vortices, with emphasis on those spin/dipole vortices formed in nanoscale ferromagnetics and ferroelectrics, and those structural domain vortices formed in multiferroic hexagonal manganites. We begin with an overview of this field. The fundamental concepts of ferroic vortices, followed by the theoretical simulation and experimental methods to explore ferroic vortices, are then introduced. The various characteristics of vortices (e.g. formation mechanisms, static/dynamic features, and electronic properties) and their controllability (e.g. by size, geometry, external thermal, electrical, magnetic, or mechanical fields) in ferromagnetics, ferroelectrics, and multiferroics are discussed in detail in individual sections. Finally, we conclude this review with an outlook on this rapidly developing field.

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“…With appropriately defining the order parameters and taking into account effects of electro-magnetro-mechanic fields, ambient temperature, and surface effects, PFS is also suitable to study multiferroic materials. Nevertheless, although PFS has been demonstrated its vitality in lots of ferroelectric materials [25][26][27][28][29], the development of PFS for multiferroic materials is still at the very beginning stage. To my best knowledge, a complete thermodynamic potential which incorporates both ferromagnetic order and ferroelectric order has not yet been reported for any single phase multiferroics.…”

Section: Methodsmentioning

confidence: 99%

Nanodots of multiferroic oxide material BiFeO3 from the first principles

Ren

2013

Adv. Manuf.

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Multiferroic nanodots can be harnessed to aid the development of the next generation of nonvolatile data storage and multi-functional devices. In this paper, we review the computational aspects of multiferroic nanodot materials and designs that hold promise for the future memory technology. Conception, methodology, and systematical studies are discussed, followed by some up-to-date experimental progress towards the ultimate limits. At the end of this paper, we outline some challenges remaining in multiferroic research, and how the first principles based approach can be employed as an important tool providing critical information to understand the emergent phenomena in multiferroics.

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Effects of the surface charge screening and temperature on the vortex domain patterns of ferroelectric nanodots

Cited by 15 publications

References 54 publications

Controllability of Vortex Domain Structure in Ferroelectric Nanodot: Fruitful Domain Patterns and Transformation Paths

Controllability of Vortex Domain Structure in Ferroelectric Nanodot: Fruitful Domain Patterns and Transformation Paths

Characteristics and controllability of vortices in ferromagnetics, ferroelectrics, and multiferroics

Nanodots of multiferroic oxide material BiFeO3 from the first principles

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