铁磁/非磁性金属异质结中界面自旋霍尔效应

作为构建新一代纯自旋流自旋电子学器件的物理基础，铁磁/非磁异质结中自旋霍尔效应包含深刻物理内涵，受到广泛关注。本项目围绕铁磁/非磁异质结中自旋霍尔效应开展研究，具体包括以下几个方面：(1) 通过改变磁性和非磁性层厚度，甄别自旋霍尔效应的体和界面贡献；(2)通过改变非磁性层中自旋霍尔耦合强度，揭示界面贡献与自旋轨道耦合强度的关系；(3)通过调控磁性和非磁性合金成分、进而费米面位置及其附近态密度分布，研究界面贡献与它们的内在联系；(4)通过比较不同非磁性层，研究磁近邻效应对界面贡献的影响机制；(5)在此基础上，揭示界面贡献与(界面对称破缺导致)Rashba自旋轨道耦合之间的内在联系。该项目实施将有助于理解自旋霍尔效应机制，也将有助于探索高自旋霍尔角的材料和体系，从而为改善以纯自旋流为基的新一代自旋电子学器件性能提供新的思路。

As the basis of the spintronic devices based on pure spin current, spin Hall effect (SHE) contains rich physics and has attracted much attention. In this project, we will study the SHE in ferromagnet (FM)/nonmagnetic metal(NM) heterostructures in the following aspects. (1)Separation of the interfacial and bulk SHEs by measuring the dependencies of the SHE on the FM and NM layer thickness. (2) By changing alloy composition of NM layers, revealing the dependence of the interfacial contribution on the spin orbit coupling (SOC) strength in the NM layers. (3) By changing alloy composition of FM and NM layers, revealing the dependence of the interfacial contribution on the Fermi level position and density of states near the Fermi level in the FM and NM layers. (4) investigating the effect of the magnetic proximity effect on the interfacial contribution. (5) Accordingly, revealing the effect of Rashba SOC on the interfacial contribution. This project will be helpful to understand the physics of the SHE, and also favors to improve the functionality of the next generation spintronic devices.