二维磁性范德华异质结界面耦合作用的电学输运研究

自旋电子学发展的核心问题之一是实现高效率的自旋探测以及操控。二维磁性材料因为将微观的自旋自由度和宏观的磁学性质联系起来，所以在自旋探测及操控方面有独特潜力。基于二维磁性材料的自旋探测以及操控主要通过界面耦合作用来实现。由于异质结界面发生的物理过程的复杂性（电荷转移、静电屏蔽、轨道杂化等过程同时作用），人们对二维磁性范德华异质结界面耦合作用的发生机制没有清晰理解。卤素化铬材料体系（CrI3, CrBr3, CrCI3）因为具有相同的晶格结构，相近的晶格常数以及不同的磁学结构成为研究磁性范德华异质结界面耦合作用的理想材料平台。本项目提出基于卤素化铬材料体系构建不同组分的磁性范德华异质结，并拟通过电学输运手段研究其界面耦合作用发生机制，以建立描述磁性范德华异质结基本电、磁学性质的有效模型，最终在模型基础上设计新型电子器件达到高效探测、操控电子自旋的目的。

The core issue of the development of spintronics is to achieve high-efficiency spin detection and manipulation. Two-dimensional magnetic materials have unique potential in spin detection and manipulation because they couple the microscopic degrees of freedom of spin with the macroscopic magnetic properties. Spin detection and manipulation based on two-dimensional magnetic materials are mainly realized through interface coupling. Due to the complexity of the physical processes that occur at the heterostructure interface (the simultaneous effects of charge transfer, electrostatic shielding, orbital hybridization, etc.), people do not have a clear understanding of the mechanism of two-dimensional magnetic van der Waals heterostructure interface coupling. The chromium halide material systems (CrI3, CrBr3, CrCI3) have the same lattice structure, similar lattice constants and different magnetic structures, which have become an ideal material platform for studying the interface coupling of magnetic van der Waals heterostructures. This project proposes to construct magnetic van der Waals heterostructures of different components based on the chromium halide material system, and intends to study the mechanism of its interface coupling through electrical transport methods to establish a description of the basic electrical and magnetic properties of magnetic van der Waals heterostructures Effective model, and finally design new electronic devices based on the model to achieve the purpose of efficiently detecting and controlling electron spin.