Spin Orbit Coupling Controlled Spin Pumping and Spin Hall Magnetoresistance Effects
Spin Orbit Coupling Controlled Spin Pumping and Spin Hall Magnetoresistance Effects
复制标题
自旋轨道耦合控制的自旋泵浦和自旋霍尔磁阻效应
DOI：
10.1002/aelm.201600112
复制
发表时间：
2016-10-01
影响因子：
6.2
通讯作者：
Zhou, Shi-Ming
中科院分区：
文献类型：
--
作者：
Ma, Li;Zhou, Heng-An;Zhou, Shi-Ming
跨金属间化合物（NM）/铁磁体界面的有效自旋混合电导（ESMC）、NM层中的自旋霍尔电导（SHC）和自旋扩散长度（SDL）决定纯自旋电流器件的功能和性能。结果表明，所有三个参数可以通过独特的Pd 1-xPtx/Y3 Fe 5 O 12系统的NM层的自旋轨道耦合（SOC）强度显着调谐。令人惊讶的是，观察到ESMC随着x从0变化到1.0而显著增加，这是由于富Pt合金的局部态密度增强。PdPt合金中的SHC由斜散射项决定。特别是，斜散射参数已首次被严格证明增加SOC强度。同时，发现当Pd原子被更重的Pt原子取代时，SDL减小，验证了多价PdPt合金中SOC诱导的自旋翻转散射模型。在目前的工作中，这些参数对SOC强度的依赖关系的透彻把握可以帮助开发一个更好的理论图的物理SOC和自旋轨道转矩切换，相关的下一代自旋电子器件。
Effective spin mixing conductance (ESMC) across the nonmagnetic metal (NM)/ferromagnet interface, spin Hall conductivity (SHC), and spin diffusion length (SDL) in the NM layer govern the functionality and performance of pure spin current devices. It is shown that all three parameters can be tuned significantly via the spin orbit coupling (SOC) strength of the NM layer by virtue of the unique Pd1‐xPtx/Y3Fe5O12 system. Surprisingly, the ESMC is observed to increase significantly with x changing from 0 to 1.0, due to the enhanced local density of states for Pt‐rich alloys. The SHC in PdPt alloys turns out to be dominated by the skew scattering term. In particular, the skew scattering parameter has for the first time been rigorously demonstrated to increase with increasing SOC strength. Meanwhile, the SDL is found to decrease when Pd atoms are replaced by heavier Pt atoms, validating the SOC induced spin flip scattering model in polyvalent PdPt alloys. A thorough grasp of the dependence of these parameters on the SOC strength in the present work can help to develop a better theoretical graph on the physics of SOC and spin orbit torque switching, relevant to next generation spintronic devices.