A synthesis and study of artificial magnetic skyrmions

报告题目：A synthesis and study of artificial magnetic skyrmions

报 告 人：Ziqiang Qiu（邱子强）Chair Professor，Dept. of Physics, UC-Berkeley

时间和地点：7月4日（周一）上午10点  中1-3113室

报告摘要：

A magnetic skyrmion is a topological twist of two-dimensional spin texture which exhibits many fascinating properties. In experiment, magnetic skyrmions were recently realized in 2009 in several experimental systems as a result of Dzyaloshinsky-Moriya interactions (DMI). An alternative approach is to produce non-collinear spins in magnetic vortex states. With this motivation, we fabricated single crystalline Co disks on perpendicularly magnetized Ni/Cu(001) film to create artificial skyrmions whose topology can be tailored by changing the relative orientation between the vortex core polarity and the surrounding perpendicular magnetization. In this way, we studied the topological effect of the skyrmion using Photoemission Electron Microscopy (PEEM). By applying an in-plane magnetic field of various strength, we find strong evidence that the annihilation of the vortex core depends on the topological skyrmion number of the system.