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Type-II Multiferroic Hf₂VC₂F₂ MXene Monolayer with High Transition Temperature
- Zhang, Jun-Jie, Lin, Lingfang, Zhang, Yang, Wu, Menghao, Yakobson, Boris I., Dong, Shuai
- Journal of the American Chemical Society 2018 v.140 no.30 pp. 9768-9773
- ambient temperature, magnetism
- 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 Hf₂VC₂F₂ monolayer is identified, where ferroelectricity originates directly from its magnetism. The noncollinear 120° 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 in the pursuit of intrinsically strong magnetoelectricity.