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Polar meron lattice in strained oxide ferroelectrics
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Polar meron lattice in strained oxide ferroelectrics
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Journal Article
Polar meron lattice in strained oxide ferroelectrics
2020
Overview
A topological meron features a non-coplanar structure, whose order parameters in the core region are perpendicular to those near the perimeter. A meron is half of a skyrmion, and both have potential applications for information carrying and storage. Although merons and skyrmions in ferromagnetic materials can be readily obtained via inter-spin interactions, their behaviour and even existence in ferroelectric materials are still elusive. Here we observe using electron microscopy not only the atomic morphology of merons with a topological charge of 1/2, but also a periodic meron lattice in ultrathin PbTiO
3
films under tensile epitaxial strain on a SmScO
3
substrate. Phase-field simulations rationalize the formation of merons for which an epitaxial strain, as a single alterable parameter, plays a critical role in the coupling of lattice and charge. This study suggests that by engineering strain at the nanoscale it should be possible to fabricate topological polar textures, which in turn could facilitate the development of nanoscale ferroelectric devices.
Merons are topological structures, but these have yet to be directly observed in ferroelectrics. Here, by epitaxially straining PbTiO
3
on a SmScO
3
substrate, electron microscopy and phase-field modelling allow the morphology and distribution of merons to be observed.
Publisher
Nature Publishing Group UK,Nature Publishing Group
