Direct observation of intrinsic room-temperature ferroelectricity in 2D layered CuCrP2S6

Weng Fu Io, Sin -Yi Pang, Lok Wing Wong, Yuqian Zhao, Ran Ding, Jianfeng Mao, Yifei Zhao, Feng Guo, Shuoguo Yuan, Jiong Zhao, Jiabao Yi and Jianhua Hao ()
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Weng Fu Io: The Hong Kong Polytechnic University
Sin -Yi Pang: The Hong Kong Polytechnic University
Lok Wing Wong: The Hong Kong Polytechnic University
Yuqian Zhao: The Hong Kong Polytechnic University
Ran Ding: The Hong Kong Polytechnic University
Jianfeng Mao: The Hong Kong Polytechnic University
Yifei Zhao: The Hong Kong Polytechnic University
Feng Guo: The Hong Kong Polytechnic University
Shuoguo Yuan: The Hong Kong Polytechnic University
Jiong Zhao: The Hong Kong Polytechnic University
Jiabao Yi: The University of Newcastle
Jianhua Hao: The Hong Kong Polytechnic University

Nature Communications, 2023, vol. 14, issue 1, 1-10

Abstract: Abstract Multiferroic materials have ignited enormous interest owing to their co-existence of ferroelectricity and ferromagnetism, which hold substantial promise for advanced device applications. However, the size effect, dangling bonds, and interface effect in traditional multiferroics severely hinder their potential in nanoscale device applications. Recent theoretical and experimental studies have evidenced the possibility of realizing two-dimensional (2D) multiferroicity in van der Waals (vdW) layered CuCrP2S6. However, the incorporation of magnetic Cr ions in the ferroelectric framework leads to antiferroelectric and antiferromagnetic orderings, while macroscopic spontaneous polarization is always absent. Herein, we report the direct observation of robust out-of-plane ferroelectricity in 2D vdW CuCrP2S6 at room temperature with a comprehensive investigation. Modification of the ferroelectric polarization states in 2D CuCrP2S6 nanoflakes is experimentally demonstrated. Moreover, external electric field-induced polarization switching and hysteresis loops are obtained in CuCrP2S6 down to ~2.6 nm (4 layers). By using atomically resolved scanning transmission electron microscopy, we unveil the origin of the emerged room-temperature ferroelectricity in 2D CuCrP2S6. Our work can facilitate the development of multifunctional nanodevices and provide important insights into the nature of ferroelectric ordering of this 2D vdW material.

Date: 2023
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DOI: 10.1038/s41467-023-43097-2

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