Magnetic two-dimensional chromium trihalides:structure,properties and modulation

摘要

The unique optical and electrical properties of two-dimensional(2D)materials provide a platform for novel van der Waals(vdW)heterojunction devices but the investigation of 2D magnetism is still limited.Recently,the emergence of long-range magnetic order atomically thin crystals expands 2D family,providing possibilities for the study of low-dimensional spin behavior and novel spintronics devices.As a specific member of magnetic van der Waals family,chromium trihalides(CrX_(3),X=Cl,Br,I)stimulated intensive interests on account of the newfangled magnetic properties.In this review,we briefly introduce the crystal structures,magnetism of the bulk and synthetic methods of 2D CrX_(3).Subsequently,the physical properties in atomically thin limit and magnetism manipulated by external field are presented.Next,some novel physical phenomena in CrX_(3) heterojunctions are discussed.Finally,the challenges and future directions are proposed.We focus on the intriguing physical phenomena in 2D magnetic CrX_(3) by combining related theoretical calculations and experimental results,providing a perspective on these emerging materials.