Engineering polar vortex from topologically trivial domain architecture

Congbing Tan, Yongqi Dong, Yuanwei Sun, Chang Liu, Pan Chen, Xiangli Zhong, Ruixue Zhu, Mingwei Liu, Jingmin Zhang, Jinbin Wang, Kaihui Liu, Xuedong Bai, Dapeng Yu, Xiaoping Ouyang, Jie Wang (), Peng Gao (), Zhenlin Luo () and Jiangyu Li ()
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Congbing Tan: Hunan University of Science and Technology
Yongqi Dong: Chinese Academy of Sciences
Yuanwei Sun: Peking University
Chang Liu: Zhejiang University
Pan Chen: Chinese Academy of Sciences
Xiangli Zhong: Xiangtan University
Ruixue Zhu: Peking University
Mingwei Liu: Hunan University of Science and Technology
Jingmin Zhang: Peking University
Jinbin Wang: Xiangtan University
Kaihui Liu: Peking University
Xuedong Bai: Chinese Academy of Sciences
Dapeng Yu: Collaborative Innovation Centre of Quantum Matter
Xiaoping Ouyang: Xiangtan University
Jie Wang: Zhejiang University
Peng Gao: Peking University
Zhenlin Luo: University of Science and Technology of China
Jiangyu Li: Southern University of Science and Technology

Nature Communications, 2021, vol. 12, issue 1, 1-8

Abstract: Abstract Topologically nontrivial polar structures are not only attractive for high-density data storage, but also for ultralow power microelectronics thanks to their exotic negative capacitance. The vast majority of polar structures emerging naturally in ferroelectrics, however, are topologically trivial, and there are enormous interests in artificially engineered polar structures possessing nontrivial topology. Here we demonstrate reconstruction of topologically trivial strip-like domain architecture into arrays of polar vortex in (PbTiO3)10/(SrTiO3)10 superlattice, accomplished by fabricating a cross-sectional lamella from the superlattice film. Using a combination of techniques for polarization mapping, atomic imaging, and three-dimensional structure visualization supported by phase field simulations, we reveal that the reconstruction relieves biaxial epitaxial strain in thin film into a uniaxial one in lamella, changing the subtle electrostatic and elastostatic energetics and providing the driving force for the polar vortex formation. The work establishes a realistic strategy for engineering polar topologies in otherwise ordinary ferroelectric superlattices.

Date: 2021
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DOI: 10.1038/s41467-021-24922-y

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