Vortex ferroelectric domains

Gruverman, Alexei; Wu, Depei; Fan, Hong Jin; Vrejoiu, Ionela; Alexe, Marin; Harrison, R. J.; Scott, J. F.

doi:10.1088/0953-8984/20/34/342201

Cited by 179 publications

(153 citation statements)

References 23 publications

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“…The skyrmion-vortex-like domain patterns predicted to occur in multi-axial ferroelectrics depend only partly on the order-parameter symmetry and require finite size effects for producing the energy-consuming depolarizing fields. 25,26 The charge-density-wave domains in compounds like 2H-TaSe 27,28 present six-branch domain configurations. They represent three spatial in-plane orientations and + or − out-of-plane ferroelastic strain, which, however, form an essentially different network with a variety of fragmented configurations related to the random array of dislocations and discommensurations required for their stabilization.…”

Section: B Other Types Of Vortex Domainsmentioning

confidence: 99%

Combinatorial model for the ferroelectric domain-network formation in hexagonal manganites

et al. 2014

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As the result of the high-temperature improper ferroelectric transition occurring in YMnO3 and other hexagonal manganites a striking domain pattern was observed: an emergence of six domains of alternating polarization from one point in a vortex-like pattern. We derive the formation and distribution of the domain-vortex network from a combinatorial analysis based on order-parameter symmetry and lattice geometry. The analysis leads to stable vortex-like configurations of the six domain states in the basal plane perpendicular to the polarization and to fragmented vortices in planes parallel to the polarization. The predictions are debated in the light of existing experimental and theoretical work on the vortex domain state. The relation of the symmetry-determined geometrical defects to the topological defects proposed to describe the behavior of YMnO3 near the Curie temperature is discussed.

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Section: B Other Types Of Vortex Domainsmentioning

confidence: 99%

Combinatorial model for the ferroelectric domain-network formation in hexagonal manganites

et al. 2014

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“…Although direct observations of vortex states in soft ferromagnetic discs and nanorings [61][62][63][64] have been made, no such unequivocal studies have been performed to date on ferroelectrics. Recent research by Gruverman et al [65] has come tantalizingly close though: using a form of stroboscopic piezoforce microscopy, the dynamics of switching in thin film ferroelectric heterostructures with circular upper electrodes were mapped. It was seen that switching initially took place around the perimeter of the capacitor [66] forming a ring, which mirrored the external circular morphology.…”

Section: Domain Behaviour In Ferroelectric Nanostructuresmentioning

confidence: 99%

Ferroelectrics at the nanoscale

Gregg¹

2009

Physica Status Solidi (a)

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There are several factors which make the investigation and understanding of nanoscale ferroelectrics particularly timely and important. Firstly, there is a market pressure, primarily from the electronics industry, to integrate ferroelectrics into devices with progressive decreases in size and increases in morphological complexity. This is perhaps best illustrated through the roadmaps for product development in FeRAM (Ferroelectric Random Access Memory) where the need for increases in bit density will require a move from 2D planar capacitor structures to 3D trenched capacitors in the next few years. Secondly, there is opportunity for novel exploration, as it is only relatively recently that developments in thin film growth of complex oxides, self‐assembly techniques and high‐resolution ‘top–down’ patterning have converged to allow the fabrication of isolated and well‐defined ferroelectric nanoshapes, the properties of which are not known. Thirdly, there is an expectation that the behaviour of small scale ferroelectrics will be different from bulk, as this group of functional materials is highly sensitive to boundary/surface conditions, which are expected to dominate the overall response when sizes are reduced into the nanoscale regime.This feature article attempts to introduce some of the current areas of discovery and debate surrounding studies on ferroelectrics at the nanoscale. The focus is directed primarily at the search for novel size‐related properties and behaviour which are not necessarily observed in bulk. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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“…[1][2][3][4][5][6][7][8] Various special patterns were seen, such as ferroelectric flux closure and quadrupolar vortex arrangements. [9][10][11][12][13][14][15][16][17][18][19] Most peculiar domain arrangements were found in theoretical model simulations conducted for rather extreme geometries of dimensions comparable with domain wall thickness, such as ultrathin films, short-period superlattices and ferroelectric nanodots. [9][10][11]13 Domain walls in ferroelectric films with an order of magnitude larger thickness (of the order of 100 nm) are expected to bear mostly bulk material properties.…”

Section: Introductionmentioning

confidence: 99%