Toroidal ferroelectricity in PbTiO3 nanoparticles

Abstract

We report from first-principles-based atomistic simulations that ferroelectricity can be sustained in PbTiO3 nanoparticles of only a few lattice constants in size as a result of a toroidal ordering. We found that size-induced topological transformations lead to the stabilization of a ferroelectric bubble by the alignment of vortex cores along a closed path. These transformations, which are driven by the aspect ratio of the nanostructure, change the topology of the polarization field, producing a rich variety of polar configurations. For sufficiently flat nanostructures, a multi-bubble state bridges the gap between 0D nanodots and 2D ultra-thin films. The thermal properties of the ferroelectric bubbles indicate that this state is suitable for the development of nanometric devices.

16 pages, 4 figures. Accepted in Phys. Rev. Lett

References in corpus (4)

• Ultrathin films of ferroelectric solid solutions under residual depolarizing field
• Unusual polarization patterns in flat epitaxial ferroelectric nanoparticles
• Interface effects in ferroelectric PbTiO${}_3$ ultrathin films on a paraelectric substrate
• Surface reconstruction and ferroelectricity in PbTiO${}_3$ thin films

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• Preparation of thin PbTiO3 Nanotubes by the Electrophoretic Deposition Method
• Switchable Topological Polar Textures in Freestanding Ultrathin Ferroelectric Oxides
• Bernoulli principle in ferroelectrics
• Ferroelectric nematic liquid crystal thermo-motor