Triferroic coupling in two-dimensional <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msub> <mml:mi>WRuCl</mml:mi> <mml:mn>6</mml:mn> </mml:msub> </mml:mrow> </mml:math>
Shiqiang Yu, Dongyue Sun, Yushuo Xu, Ying Dai, Baibiao Huang, Wei Wei
Abstract
In this work, we report that electrically controlled ferroic properties and multistate storage can be achieved in dual-metal trihalide ${\mathrm{WRuCl}}_{6}$ monolayer from the perspectives of first-principles calculations. We confirm that it is a rare two-dimensional (2D) triferroics, and, particularly, ferromagnetism and ferroelasticity are coupled strongly to the ferroelectricity of 120 \ifmmode^\circ\else\textdegree\fi{} rotation symmetry. It therefore can enable the flexible and reversible switching of ferroic orders via electric field. In addition, ${\mathrm{WRuCl}}_{6}$ monolayer is an intrinsic bipolar magnetic semiconductor; thus, the switchable spin-polarized carrier can be obtained by applying an electric gate voltage. Therefore, it provides an extra parameter to further improve the storage density. Our work not only offers a paradigm for the multiferroic coupling physics, but also provides a promising platform for multistate storage and multifunctional nanodevices.