近十年来，二维狄拉克电子系统、二维磁性材料以及它们的界面是低维凝聚态物理多个研究分支方向共同关心的体系。其中前者以石墨烯、拓扑绝缘体为代表，后者随着最近单层范德瓦尔斯薄膜铁磁性的发现也得到了关注。目前，理论和实验都高度关注二维磁性材料向狄拉克费米子系统中引入铁磁序产生的量子反常霍尔效应，鲜有人关注在这一界面体系中二维磁性受到狄拉克电子的影响。相关研究表明，当这两个体系以范德瓦尔斯力形成异质结，狄拉克电子系统也有强化铁磁相互作用的效果。该效果受狄拉克电子的动量、色散以及晶格等因素与磁性材料之间的耦合所影响。因此，本项目将主要从实验上研究二维磁性材料与狄拉克电子系统的异质结体系，探索狄拉克电子系统增强磁有序的作用机制，有效提升二维磁性材料的磁学特性。

The 2D Dirac electronic system, the 2D magnets, and their interfaces have been intensively studied in many topics of condensed matter physics in low dimension for the last decade. Graphene and topological insulators are the most concerned members of the former, while the research on the latter arises with the discovery of several types of single van der Waals layer ferromagnets. Lots of attention has been paid to the quantum anomalous Hall effect in both experimental and theoretical research, which emerges from the Dirac electronic states with induced ferromagnetism. However, the impact of Dirac electronic states on the 2D magnetism is more-or-less neglected. It is implied by relevant previous researches that the Dirac electronic system tends to enhance the ferromagnetic coupling when these two systems form an interface via the van der Waals interaction. The strength of interaction is expected to be related to how the momentum, dispersion, lattice, etc. of the Dirac electronic states couple to the 2D magnet. For these reasons, the aim of this project is to understand the physical mechanism of the interaction, to search for the opportunities of raising the value of 2D magnets in application and to stimulate new arts of interface engineering to modify the performance of 2D materials.