Pinning effects of dislocations on vortex domain structure in ferroelectric nanodots

Chen, W. J.; Zheng, Yue; Wang, Biao

doi:10.1063/1.4881884

Cited by 12 publications

(5 citation statements)

References 36 publications

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“…Moreover, the vortex state should be distinguished in the nanodot with defect under this CSC condition. Interestingly, according to previous work, 48 the vortex core can be pinned by the defect. Thus, the kind of defect may be understood by analyzing the I-t curve, which is related to the vortex orientation.…”

Section: Discussionsupporting

confidence: 54%

Size-dependent and distinguishing degenerated vortex states in ferroelectric nanodots under controllable surface charge conditions

et al. 2016

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Section: Discussionsupporting

confidence: 54%

Size-dependent and distinguishing degenerated vortex states in ferroelectric nanodots under controllable surface charge conditions

et al. 2016

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“…In the past decade, great efforts have been made in pursuit of switching the chirality of ferroelectric vortices by an experimentally feasible way. So far, the strategies of vortex switching reported in the literature are to introduce a region of "dominant dipoles" during vortex nucleation in ferroelectrics via different methods, such as making use of the geometry asymmetry, 17 mechanical stress field, 18,19 defect engineering, [18][19][20] inhomogeneous electric field, 21 and a sweeping biased tip. 22 Despite these achievements, facile manipulation of the toroidal order in ferroelectrics remains challenging.…”

Section: Introductionmentioning

confidence: 99%

Controlling polar-toroidal multi-order states in twisted ferroelectric nanowires

Yuan

Ding

et al. 2018

npj Comput Mater

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The toroidal order of electric dipoles in ferroelectric materials has attracted attention in the past decade due to fascinating properties and great potential for enabling novel memory devices, and functional devices in general. However, facile manipulation of toroidal order in ferroelectrics remains challenging. Here, using first-principles derived simulations, we demonstrate an efficient scheme to control the polar-toroidal multi-order (PTMO) states in ferroelectric nanowires. Two feasible strategies of controlling PTMO states by a combination of homogeneous electric field and torque are carried out in ferroelectric/paraelectric composite nanowires. This is possible based on trilinear coupling between polarization, toroidization and the twist force. As a result, switching of the toroidization of the nanowire can be readily achieved by reversal of the axial polarization. The torque threshold needed to control PTMO states is also calculated and found to be relatively small, indicating the feasibility of this method. Our study demonstrates facile control of PTMO states, including ferroelectric skyrmions, in ferroelectrics and is a step towards designing ferroelectric devices based on multi-order states.

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“…Pacman-shaped nanodisks, nanorings with an off-center hole, nanodots with embedded off-center holes or defects, and nanodisks with a thickness gradient, etc. The asymmetric configuration of ferroic nanostructures has been demonstrated to play an important role on the nucleation and transformation of magnetic and ferroelectric dipole vortices, leading to vortex pinning effects [209,210] and the feasibility of switching of the vortex chirality by applying a homogenous static field [99,[210][211][212]. Pacman-shaped nanodisks and asymmetric nanorings can be fabricated by lithography methods such as electron beam lithography combined with lift-off or ion beam etching [211,[213][214][215][216][217][218][219][220][221][222][223][224][225][226][227].…”

Section: Synthesis Of Low-dimensional Ferroic Structuresmentioning

confidence: 99%

“…As for ferroelectric vortex domain structures, the effects of mechanical strains/stresses on the vortex formation in various systems as well as their effects on vortex switching have been revealed by several works (see, e.g. [94,210,212]). It is natural to wonder if mechanical loads can act like the role of electric field to induce transformation of ferroelectric vortices.…”

Section: Transformation Of Ferroelectric Vortices By Mechanicalmentioning

confidence: 99%

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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Pinning effects of dislocations on vortex domain structure in ferroelectric nanodots

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

Cited by 12 publications

References 36 publications

Size-dependent and distinguishing degenerated vortex states in ferroelectric nanodots under controllable surface charge conditions

Size-dependent and distinguishing degenerated vortex states in ferroelectric nanodots under controllable surface charge conditions

Controlling polar-toroidal multi-order states in twisted ferroelectric nanowires

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

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