Coexistence of toroidal and polar domains in ferroelectric systems: A strategy for switching ferroelectric vortex

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

doi:10.1063/1.4881530

Cited by 29 publications

(15 citation statements)

References 28 publications

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“…8) for an n = 14 superlattice (Methods and Supplementary Fig. 9) and is consistent with previous predictions for low-dimensional ferroelectrics 23,[30][31][32][33] . Such axial polarization can be experimentally observed by focusing on a region of phase coexistence (that is, alternating ferroelectric a 1 /a 2 and vortex stripes, Fig.…”

supporting

confidence: 91%

“…In the case of ferroelectrics, several theoretical studies [20][21][22][23][24] have proposed complex polarization topologies (reminiscent of rotational spin topologies) in low-dimensional structures. The models have predicted the formation of polarization waves, vortices and so on that can be characterized by an emergent order parameter, a so-called electric toroidal moment (G = (1/2V ) r × P(r) d 3 r; refs 20,22,25).…”

mentioning

confidence: 99%

“…The presence of this axial polarization component is interesting because it suggests the formation of a multi-order-parameter state. In turn, electric-field control of toroidal order is of great interest because it offers the potential for new cross-coupled functions [20][21][22][23][24] . To explore this concept, the time-dependent evolution of both the vortex and a 1 /a 2 regions of a mixed-phase structure was explored under an applied out-of-plane voltage (15 V) using phase-field models.…”

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confidence: 99%

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Phase coexistence and electric-field control of toroidal order in oxide superlattices

et al. 2017

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Systems that exhibit phase competition, order parameter coexistence, and emergent order parameter topologies constitute a major part of modern condensed-matter physics. Here, by applying a range of characterization techniques, and simulations, we observe that in PbTiO/SrTiO superlattices all of these effects can be found. By exploring superlattice period-, temperature- and field-dependent evolution of these structures, we observe several new features. First, it is possible to engineer phase coexistence mediated by a first-order phase transition between an emergent, low-temperature vortex phase with electric toroidal order and a high-temperature ferroelectric a/a phase. At room temperature, the coexisting vortex and ferroelectric phases form a mesoscale, fibre-textured hierarchical superstructure. The vortex phase possesses an axial polarization, set by the net polarization of the surrounding ferroelectric domains, such that it possesses a multi-order-parameter state and belongs to a class of gyrotropic electrotoroidal compounds. Finally, application of electric fields to this mixed-phase system permits interconversion between the vortex and the ferroelectric phases concomitant with order-of-magnitude changes in piezoelectric and nonlinear optical responses. Our findings suggest new cross-coupled functionalities.

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confidence: 91%

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confidence: 99%

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confidence: 99%

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Phase coexistence and electric-field control of toroidal order in oxide superlattices

et al. 2017

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“…A particular kind of systems are composite structures which consist of polar components and toroidal components like nanodots embedded in a polar matrix, 24 and ferroelectric film-dot system. 25 The second kind of systems are particular nanosystems made of rhombohedral phase ferroelectrics and under anisotropic screening condition, such as BaTiO 3 and BaTiO 3 /SrTiO 3 composite nanowires. [14][15][16]23 The most important feature of a PTMO state is the coexistence and possible coupling between the polar order and toroidal order, which gives rise to the distinguished behaviors of a PTMO state compared with purely toroidal or polar state.…”

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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“…[87] In particular, it has been proposed that vortex structures could give rise to a multifold increase in storage capacity for non-volatile ferroelectric RAM. [89] Despite considerable theoretical and modeling work, [90][91][92] it was only in the last year that such novel topologies of polarization were experimentally realized. For example, smoothly varying polar vortices, were created and observed in superlattices of paraelectric SrTiO 3 and ferroelectric PbTiO 3 [Figs.…”

Section: Reshaping Ferroic Physics-exploring Exotic and Emergent Polamentioning

confidence: 99%

Frontiers in strain-engineered multifunctional ferroic materials

Agar

Pandya

et al. 2016

MRS Communications

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Multifunctional, complex oxides capable of exhibiting highly-coupled electrical, mechanical, thermal, and magnetic susceptibilities have been pursued to address a range of salient technological challenges. Today, efforts are focused on addressing the pressing needs of a range of applications and identifying, understanding, and controlling materials with the potential for enhanced or novel responses. In this prospective, we highlight important developments in theoretical and computational techniques, materials synthesis, and characterization techniques. We explore how these new approaches could revolutionize our ability to discover, probe, and engineer these materials and provide a context for new arenas where these materials might make an impact.

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Coexistence of toroidal and polar domains in ferroelectric systems: A strategy for switching ferroelectric vortex

Cited by 29 publications

References 28 publications

Phase coexistence and electric-field control of toroidal order in oxide superlattices

Phase coexistence and electric-field control of toroidal order in oxide superlattices

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

Frontiers in strain-engineered multifunctional ferroic materials

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