Ferroelectric Vortices and Related Configurations

Prosandeev, Sergey; Naumov, Ivan; Fu, Huaxiang; Bellaïche, L.; Campbell, Michael; McQuaid, R. G. P.; Chang, L.-W.; Schilling, A.; McGilly, L. J.; Kumar, Amit; Gregg, J. M.

doi:10.1002/9781118935743.ch22

Cited by 6 publications

(7 citation statements)

References 80 publications

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“…4 of the Supplemental Material (472), which is inevitably reduced in the number of examples due to size constraints. Reviews on unusual electric dipole textures that summarized activities on that field of research from about 2003 to 2015 were given by Ponomareva et al (2005a), Kornev, Fu, and Bellaiche (2006), Kornev et al (2008), Prosandeev, Ponomareva, Naumov et al (2008, Prosandeev andProsandeev et al (2016).…”

Section: F Experimental Breakthrough For the Characterization Of The ...mentioning

confidence: 99%

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Topological phases in polar oxide nanostructures

et al. 2023

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The past decade has witnessed dramatic progress related to various aspects of emergent topological polar textures in oxide nanostructures displaying vortices, skyrmions, merons, hopfions, dipolar waves, or labyrinthine domains, among others. For a long time, these nontrivial structures (the electric counterparts of the exotic spin textures) were not expected due to the high energy cost associated with the dipolar anisotropy: the smooth and continuous evolution of the local polarization to produce

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Section: F Experimental Breakthrough For the Characterization Of The ...mentioning

confidence: 99%

“…The two-and three-dimensional vortex structures can be characterized using the toroidal and hypertoroidal moments (Dubovik and Tugushev, 1990;Prosandeev andBellaiche, 2008b, 2009). The toroidal moment, commonly denoted as T or G, is equal to…”

Section: Physical Characteristics Of Polar Topological Statesmentioning

confidence: 99%

Topological phases in polar oxide nanostructures

et al. 2023

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“…Domains with alternating polarization, polar vortices, ferroelectric bubbles, multi-vortex states, and skyrmions are representative examples. [11][12][13][14][15][16][17] Recent experimental advances have allowed the synthesis of perovskite nanocrystals with well-defined sizes and shapes, opening the possibility to fabricate nanoparticles with specific polar states that can be used for different applications. 18 The understanding of the formation process and stability of different polar configurations is then essential to gain control over their functional properties.…”

Section: Introductionmentioning

confidence: 99%

Topology of the polarization field in PbTiO3 nanoparticles of different shapes by atomic-level simulations

Rino

Sepliarsky

Stachiotti

2020

Journal of Applied Physics

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An atomistic model approach parameterized from first-principles calculations is used to investigate size and shape effects on the polarization field in isolated stress-free PbTiO 3 nanoparticles. The study was carried out by molecular dynamics simulations in free-standing nanodots of cylindrical, spherical, and ellipsoidal shapes. We show that in cylinders with diameter equal to height, the size-induced transformation from the vortex to the flux-closure domain configuration causes an anomaly in the behavior of the toroidal moment and the volume of the system. During this transformation, the vortex core evolves into domain walls while the resulting structure is stabilized due to the nonhomogeneous distribution of polarization and strain inside the domains. A similar behavior is observed in elongated cylinders, spheres, and spheroids. The increment in the diameter/height relation of the nanoparticles gives rise to a succession of topological transformations that include multi-vortex configurations, ferroelectric bubble states, and multi-domain patterns. While the transformation path for flat cylinders is similar to the one previously obtained for cuboids, the thinner edge region of the spheroids prevents the stabilization of one-and twobubble states. Despite this last difference, our results indicate that the polarization pattern of a nanoparticle depends more on its aspect ratio than on its shape.

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“…(i) In the a 1 /a 2 -phase, domains with a polarization along [100] or [010], termed a 1 and a 2 domains, respectively, arrange in alternating stripes. (ii) In the vortex phase, long-range ordered arrays of electric dipole vortex structures [26] extend in a tubular way along [100]. In addition to the vortexlike arrangement of dipole moments around the vortex core, the resulting tubuli exhibit a net polarization along their central axis in the [100] direction.…”

Section: A Characterization Of Ordering Of Dipole Moments In the Pto|...mentioning

confidence: 99%

Optical second harmonic signature of phase coexistence in ferroelectric|dielectric heterostructures

et al. 2022

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An exotic coexistence of polar states is known to occur in ferroelectric|dielectric PbTiO 3 |SrTiO 3 (PTO|STO) heterostructures. In the PTO layers with a thickness of 10-20 unit cells, in-plane-polarized regions order alongside the so-called vortex phase with a whirl-like arrangement of electric dipoles. We investigate the optical signature of these polar phases noninvasively using optical second harmonic generation (SHG) on PTO|STO-based heterostructures. We identify the phase coexistence down to a single PTO|STO bilayer. By comparing the SHG yield in dependence of the number of PTO layers, we further find that interlayer coupling plays an important role in setting the final polarization state. Our nonlinear optical experiments demonstrate the potential of this noninvasive approach for the identification and understanding of complex noncollinear ordering of dipole moments in oxide heterostructures and lays the groundwork for their operando investigation.

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Ferroelectric Vortices and Related Configurations

Cited by 6 publications

References 80 publications

Topological phases in polar oxide nanostructures

Topological phases in polar oxide nanostructures

Topology of the polarization field in PbTiO3 nanoparticles of different shapes by atomic-level simulations

Optical second harmonic signature of phase coexistence in ferroelectric|dielectric heterostructures

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