外延
凝聚态物理
铁电性
空中骑兵
材料科学
拓扑(电路)
格子(音乐)
拓扑缺陷
纳米尺度
铁磁性
纳米技术
光电子学
物理
图层(电子)
数学
声学
组合数学
电介质
作者
Yujia Wang,Yuan Ping Feng,Yin‐Lian Zhu,Yun‐Long Tang,Lixin Yang,Min‐Jie Zou,Wan‐Rong Geng,Mengjiao Han,Xiangwei Guo,Bo Wu,Xiuliang Ma
出处
期刊:Nature Materials
[Springer Nature]
日期:2020-06-01
卷期号:19 (8): 881-886
被引量:192
标识
DOI:10.1038/s41563-020-0694-8
摘要
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 PbTiO3 films under tensile epitaxial strain on a SmScO3 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 PbTiO3 on a SmScO3 substrate, electron microscopy and phase-field modelling allow the morphology and distribution of merons to be observed.
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