Design of Two-Dimensional Multiferroics with Direct Polarization-Magnetization Coupling
Design of Two-Dimensional Multiferroics with Direct Polarization-Magnetization Coupling
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直接极化-磁化耦合二维多铁性材料的设计
DOI：
10.1103/physrevlett.125.017601
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发表时间：
2020
影响因子：
8.6
通讯作者：
Lu Xiaomei
中科院分区：
文献类型：
--
作者：
Zhang Junting;Shen Xiaofan;Wang Yancheng;Ji Chao;Zhou Ying;Wang Jianli;Huang Fengzhen;Lu Xiaomei
最近在货车德瓦耳斯材料中发现的二维铁磁性为利用电场控制二维磁性打开了大门。在这里，我们证明了磁化反转通过开关极化在一个设计的二维多铁性氧化物结合群论分析和第一性原理计算。我们表明，铁电性可以诱导由一个特定的八面体旋转的钙钛矿双层。铁磁性可以通过将指导方针扩展到B位有序的双钙钛矿双层来同时引入。我们已经发现了两个极化和磁化之间的耦合机制，使铁电开关的面内磁化反转。我们的工作为具有内禀磁电耦合的二维多铁性材料的设计提供了指导，并有助于通过电场控制二维磁性。
The recent discovery of two-dimensional (2D) ferromagnetism in van der Waals materials has opened the door to the control of 2D magnetism by means of electric field. Here we demonstrate the magnetization reversal through switching polarization in a designed 2D multiferroic oxide by combining group theory analysis and first-principles calculation. We show that ferroelectricity can be induced by a specific octahedral rotation in a perovskite bilayer. Ferromagnetism can be introduced simultaneously by extending the guideline to the B-site ordered double-perovskite bilayer. We have found two coupling mechanisms between polarization and magnetization that enable the reversal of the in-plane magnetization by ferroelectric switching. Our work provides guidelines for the design of 2D multiferroics with intrinsic magnetoelectric coupling and helps to control the 2D magnetism by electric field.