物理学院学术报告（第34期）

报告题目：Novel spin-orbit torques to control two-dimensional ferromagnets and antiferromagnets

报告专家：Dr. Fei Xue    University of Alabama at Birmingham

报告时间：2024年06月13日（周四）15:00

报告地点：理六栋302        邀请人：朱起忠

报告内容：

In ferromagnetic systems lacking inversion symmetry, an applied electric field can control the ferromagnetic order parameters through spin-orbit torque. The prototypical example is a bilayer heterostructure composed of a ferromagnet and a heavy metal that acts as a spin current source. In addition to such ferromagnetic bilayers, spin-orbit coupling can mediate spin-orbit torques in ferromagnets that lack bulk inversion symmetry or antiferromagnets that lack local inversion symmetry. In this talk, I will present our recent first-principles calculations of novel spin-orbit torque in 2D noncentrosymmetric ferromagnets and 2D PT-symmetric antiferromagnets. In the first example, we show that monolayer Fe3GeTe2 supports new higher-order angular dependence of spin-orbit torque that gives rise to deterministic switching of perpendicular magnetization. In the second example, we show that bilayer CrI3 supports a new type of staggered dampinglike torque that can deterministically switch perpendicular Neel order and induce sub-THz magnetization oscillation.

专家简介：

Dr. Fei Xue obtained his BS from Nanjing University in China in 2012 and PhD in condensed matter theory from the University of Texas at Austin in 2018. He then became a joint postdoctoral researcher at NIST and University of Maryland. He joined University of Alabama at Birmingham as an assistant professor in Department of Physics in 2021. His research interests include Interaction-induced exotic phases and collective excitations in novel quantum phases of matter, and quantum transport phenomena due to spin-orbit coupling from first-principles calculation.