Polar Bloch points in strained ferroelectric films

Yu-Jia Wang, Yan-Peng Feng, Yun-Long Tang, Yin-Lian Zhu, Yi Cao, Min-Jie Zou, Wan-Rong Geng and Xiu-Liang Ma ()
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Yu-Jia Wang: Chinese Academy of Sciences
Yan-Peng Feng: Songshan Lake Materials Laboratory
Yun-Long Tang: Chinese Academy of Sciences
Yin-Lian Zhu: Songshan Lake Materials Laboratory
Yi Cao: Chinese Academy of Sciences
Min-Jie Zou: Songshan Lake Materials Laboratory
Wan-Rong Geng: Songshan Lake Materials Laboratory
Xiu-Liang Ma: Songshan Lake Materials Laboratory

Nature Communications, 2024, vol. 15, issue 1, 1-8

Abstract: Abstract Topological domain structures have drawn great attention as they have potential applications in future electronic devices. As an important concept linking the quantum and classical magnetism, a magnetic Bloch point, predicted in 1960s but not observed directly so far, is a singular point around which magnetization vectors orient to nearly all directions. Here we show polar Bloch points in tensile-strained ultrathin ferroelectric PbTiO3 films, which are alternatively visualized by phase-field simulations and aberration-corrected scanning transmission electron microscopic imaging. The phase-field simulations indicate local steady-state negative capacitance around the Bloch points. The observation of polar Bloch points and their emergent properties consequently implies novel applications in future integrated circuits and low power electronic devices.

Date: 2024
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DOI: 10.1038/s41467-024-48216-1

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