The Hong Kong University of Science and Technology

报告人简介：

Professor Wang Xiangrong obtained his PhD degree in 1990 from the University of Rochester. He joined the Physics Department of the Hong Kong University of Science and Technology in 1992 and is currently a professor there. Professor Wang is working in the field of theoretical condensed matter physics and statistical physics. His current research interests include topological objects and topological states, magnetization dynamics and spintronics.

报告摘要：

In this talk, I will first discuss several progresses made in our group about fundamental properties of skyrmions in chiral magnetic films. These include 1) skyrmion sizes in isolated, in crystal, or in stripy forms; 2) skyrmion nucleation, formation, and potential barrier energies; 3) the roles of magnetic field in skyrmion crystal formation; 4) the stability and existing conditions of composite skyrmions such as target skyrmions and skyrmion bags/cluster; 5) topological equivalence of stripy phases and skyrmion crystals. Then I will discuss a new theory about widely observed unusual anisotropic magnetoresistance (UAMR) in bilayers which leads to the notion of the spin-Hall MR (SMR) in the famous SMR theory. The theory is based on the universal features in all bilayer heterostructure: resistivity tensor depends on magnetization and interfacial field. I will show that the angular dependencies of UAMR do not depend on the microscopic details, thus are universal. Experiments that can test this theory against the SMR theory are also proposed.

邀请人：胡凤霞（8264 9233）

联系人：胡颖（8264 9361）