Type-II multiferroic Hf${}_2$VC${}_2$F${}_2$ MXene monolayer with high transition temperature

Abstract

Achieving multiferroic two-dimensional (2D) materials should enable numerous functionalities in nanoscale devices. Until now, however, predicted 2D multiferroics are very few and with coexisting yet only loosely coupled (type-I) ferroelectricity and magnetism. Here, a type-II multiferroic MXene Hf${}_2$VC${}_2$F${}_2$ monolayer is identified, where ferroelectricity originates directly from its magnetism. The noncollinear Y-type spin order generates a polarization perpendicular to the spin helical plane. Remarkably, the multiferroic transition is estimated to occur above room temperature. Our investigation should open the door to a new branch of 2D materials for pursuit of intrinsically strong magnetoelectricity.

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• Ferroic orders in two-dimensional transition/rare-earth metal halides
• Peierls transition driven ferroelasticity in two-dimensional $d$-$f$ hybrid magnet
• Gadolinium halide monolayers: a fertile family of two-dimensional 4f magnets
• Decoupled Strain Response of Ferroic Properties in Multiferroic VOCl2 Monolayer
• Structural reconstruction and anisotropic conductance in $4f$-ferromagnetic monolayer