Ferroelectric polarization and magnetic structure at domain walls in a multiferroic film

Ang Tao, Yixiao Jiang, Shanshan Chen, Yuqiao Zhang, Yi Cao, Tingting Yao, Chunlin Chen (), Hengqiang Ye and Xiu-Liang Ma ()
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Ang Tao: Chinese Academy of Sciences
Yixiao Jiang: Chinese Academy of Sciences
Shanshan Chen: Chinese Academy of Sciences
Yuqiao Zhang: Jiangsu University
Yi Cao: Chinese Academy of Sciences
Tingting Yao: Chinese Academy of Sciences
Chunlin Chen: Chinese Academy of Sciences
Hengqiang Ye: Jihua Lab
Xiu-Liang Ma: Chinese Academy of Sciences

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

Abstract: Abstract Domain walls affect significantly ferroelectric and magnetic properties of magnetoelectric multiferroics. The stereotype is that the ferroelectric polarization will reduce at the domain walls due to the incomplete shielding of depolarization field or the effects of gradient energy. By combining transmission electron microscopy and first-principles calculations, we demonstrate that the ferroelectric polarization of tail-to-tail 180° domain walls in ε-Fe2O3 is regulated by the bound charge density. A huge enhancement (43%) of ferroelectric polarization is observed in the type I domain wall with a low bound charge density, while the ferroelectric polarization is reduced to almost zero at the type II domain wall with a high bound charge density. The magnetic coupling across the type I and type II ferroelectric domain walls are antiferromagnetic and ferromagnetic, respectively. Revealing mechanisms for enhancing ferroelectric polarization and magnetic behaviors at ferroelectric domain walls may promote the fundamental research and potential applications of magnetoelectric multiferroics.

Date: 2024
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DOI: 10.1038/s41467-024-50431-9

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