学术报告-马丽 西安理工大学——Spin Pumping and Spin Hall Magnetoresistance Effects in PtPd/YIG heterostructures

2018年01月10日 10:37  


间:2018年1月12日(周五)10:30

长安校区理学院383会议室

报告题目:Spin Pumping and Spin Hall Magnetoresistance Effects in PtPd/YIG heterostructures

人:马丽西安理工大学

报告摘要:The production, detection and controlling of pure spin current is an important research topic in Spintronics. It is significant to improve the production of the pure spin current. The effect of spin orbit coupling (SOC) on the spin mixing conductance and spin Hall effect from spin pumping in PtxPd1-x /YIG were studied in both experiments and theory. The spin mixing conductance and the spin Hall angle can be regulated by spin-orbit interaction. The spin Hall conductivity 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. The spin diffusion length (SDL) was studied by spin Hall magnetoresistance (SMR). SDL is found to decrease when Pd atoms are replaced by heavier Pt atoms. Meanwhile, the spin diffusion length is invariant when the electron momentum relaxation time changes, indicating the observation of D’yakonov-Perel’ spin relaxation mechanism in PtPd/YIG heterostructures. The physical framework based on D’yakonov-Perel’ mechanism also explains the non-monotonic temperature dependence of the spin Hall angle. A thorough grasp of the dependence of these parameters on the SOC strength in the present work could help to develop a better theoretical graph on the physics of SOC and spin orbit torque switching, relevant to next generation spintronic devices.

报告人简介:马丽老师2011年在同济大学取得学士学位,之后在同济大学攻读博士学位,师从世界著名的自旋电子学专家周仕明教授,期间赴美国Johns Hopkins University的钱嘉陵教授课题组交流访学,并于2016年取得凝聚态物理理学博士学位。研究课题主要为自旋轨道耦合对FePtPd及PtPd/YIG体系磁性影响。马老师目前已在Physical review letter,Physical Review B, Applied Physics Letters, Journal of Applied Physics等期刊发表论文多篇。

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