报告题目：Spin and Orbital Torques towards Efficient Spin-Orbitronic Devices

报告人：丁石磊 博士

邀请人：吴锐 教授

时间：2024年7月20日 10:30 - 12:00

地点：广州国际校区 C2a-207

欢迎广大师生踊跃参加。

自旋科技研究院

2024年7月16日

报告摘要：

Electronic devices based on charge motion have been well-studied and widely used in technological devices. However, the electrons can carry not only charges but also spin and orbital angular momentum. Nonequilibrium spin and orbital currents mediate the transfer of the angular momentum to the neighboring magnetic materials enabling the development of efficient spin orbitronic devices. Decoupling these currents from a flow of electronic charges opens opportunities for the electrical control of the magnetization. In this talk, I will first present the efficient spin torque in the magnetic insulators, including current-driving domain wall motion and the Dzyaloshinskii–Moriya interaction. In the second part of the talk, I will present the orbital torque and orbital Rashba-Edelstein magnetoresistance in the light metal system. The orbital-to-spin conversion plays a crucial role in the orbital torque, and the conversion layer can be ferromagnetic metal itself, 3d, 4f, and 5d non-magnetic metals. Our work indicates the efficient current-induced torque in the insulating system with a lower joule heating, and our results on orbital torques show that the magnitude of the orbital torque can be larger than the spin torque. The results further provide insight into the efficient current-induced torques with orbital current from low-cost, environmentally friendly light metals.

报告人简介：

Dr. Shilei Ding received his B.S. in Physics from Peking University, China in 2016, and he received his Ph.D in Condensed Matter Physics from the School of Physics, Peking University (supervisor: Prof. Jinbo Yang). Between 2018 and 2019, as well as from 2020 to 2021, he was a guest Ph.D. student in the Lab of Prof. Mathias Kläui at Mainz University, Germany. He is now a Postdoctoral Researcher in the Lab of Prof. Pietro Gambardella at Eidgenössische Technische Hochschule Zürich (ETH Zurich), Switzerland. His research focuses on nonequilibrium spin and orbital current towards spin orbitronic devices, and he has published more than 30 papers in leading journals, including Physical Review Letters, Advanced Materials, etc.