Hybrid improper ferroelectricity and magnetoelectric coupling in a two-dimensional perovskite oxide

被引:11
作者
Zhou, Ying [1 ]
Chen, Zefeng [1 ]
Wu, Zongshuo [1 ]
Shen, Xiaofan [1 ]
Wang, Jianli [1 ]
Zhang, Junting [1 ]
Sun, Hui [2 ]
机构
[1] China Univ Min & Technol, Sch Mat Sci & Phys, Xuzhou 221116, Jiangsu, Peoples R China
[2] Yangzhou Univ, Coll Phys Sci & Technol, Yangzhou 225002, Jiangsu, Peoples R China
基金
中国国家自然科学基金;
关键词
INTRINSIC FERROMAGNETISM; CRITICAL THICKNESS; DISCOVERY; CRYSTAL; ABSENCE;
D O I
10.1103/PhysRevB.103.224409
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Unlike van der Waals materials, perovskite oxide may undergo structural reconstruction when reduced to two dimensions. Therefore, it is still an open question whether some of the ferroelectric mechanisms and magnetoelectric coupling effects found in perovskite bulks can be maintained at the two-dimensional (2D) limit. Here we demonstrate that the ferroelectricity induced by octahedral rotation and the magnetoelectric coupling mechanism dependent on Dzyaloshinskii-Moriya (DM) interaction exist in a proposed perovskite bilayer. Although the octahedral rotation distortion of the Ca3Mn2O7 bilayer is reconstructed with respect to its layered bulk phase, tensile strain can induce the same octahedral rotation type as its bulk phase, resulting in the emergence of ferroelectric phase. We show that the modulation of the DM vector by octahedral rotation distortion provides a coupling between polarization and the induced magnetization. In ferroelectric switching, the polarization is reversed by a 180 degrees rotation of the tilt axis within the ab plane, which also results in a reversal of magnetization. This work is expected to provide a guidance for realizing electric-field control of magnetization direction in 2D perovskite oxides.
引用
收藏
页数:7
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