Xu Meiling, Huang Chengxi, Li Yinwei, Liu Siyu, Zhong Xin, Jena Puru, Kan Erjun, Wang Yanchao
School of Physics and Electronic Engineering, Jiangsu Normal University, Xuzhou 221116, China.
Department of Applied Physics and Institution of Energy and Microstructure, Nanjing University of Science and Technology, Nanjing, Jiangsu 210094, China.
Phys Rev Lett. 2020 Feb 14;124(6):067602. doi: 10.1103/PhysRevLett.124.067602.
Controlling magnetism of two-dimensional multiferroics by an external electric field provides special opportunities for both fundamental research and future development of low-cost electronic nanodevices. Here, we report a general scheme for realizing a magnetic phase transition in 2D type-I multiferroic systems through the reversal of ferroelectric polarization. Based on first-principles calculations, we demonstrate that a single-phase 2D multiferroic, namely, ReWCl_{6} monolayer, exhibits two different low-symmetric (C_{2}) phases with opposite in-plane electric polarization and different magnetic order. As a result, an antiferromagnetic-to-ferromagnetic phase transition can be realized by reversing the in-plane electric polarization through the application of an external electric field. These findings not only enrich the 2D multiferroic family, but also uncover a unique and general mechanism to control magnetism by electric field, thus stimulating experimental interest.
通过外部电场控制二维多铁性材料的磁性，为基础研究和低成本电子纳米器件的未来发展都提供了特殊机遇。在此，我们报告了一种通过铁电极化反转在二维I型多铁性体系中实现磁相变的通用方案。基于第一性原理计算，我们证明了一种单相二维多铁性材料，即ReWCl₆单层，呈现出两种具有相反面内电极化和不同磁序的低对称（C₂）相。因此，通过施加外部电场反转面内电极化，可以实现反铁磁到铁磁的相变。这些发现不仅丰富了二维多铁性材料家族，还揭示了一种独特且通用的电场控制磁性的机制，从而激发了实验兴趣。
