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Since the discovery of graphene, two-dimensional materials with atomic levelthickness have rapidly grown to be a prosperous field of physical science withinterdisciplinary interests, for their fascinating properties and broadapplications. Very recently, the experimental observation of ferromagnetism inCr$_2$Ge$_2$Te$_6$ bilayer and CrI$_3$ monolayer opened a door to pursuitlong-absent intrinsic magnetic orders in two-dimensional materials. Meanwhile,the ferroelectricity was also experimentally found in SnTe monolayer andCuInP$_2$S$_6$ few layers. The emergence of these ferroic orders in thetwo-dimensional limit not only brings new challenges to our physical knowledge,but also provides more functionalities for potential applications. Amongvarious two-dimensional ferroic ordered materials, transition/rare-earth metalhalides and their derivants are very common. In this Research Update, based ontransition/rare-earth metal halides, the physics of various ferroic orders intwo-dimensional will be illustrated. The potential applications based on theirmagnetic and polar properties will also be discussed.

Ferroic orders in two-dimensional transition/rare-earth metal halides