报告时间：11月21日，8：45

报告地点：物理楼138室

题目：自旋电子材料与器件中的斯格明子及其应用

Abstract：

Magnetic skyrmions are swirling topological spin textures, which are promising for future spintronic applications. Room-temperature skyrmions in ferromagnetic thin films are of particular importance for practical applications in memory and data storage devices, due to their compatibility with existing manufacturing techniques. In this talk, I will present a method for creating a stable skyrmion phase in a perpendicularly magnetized Ta/CoFeB/MgO material system commonly used for magnetic memory applications, by engineering the interfacial perpendicular magnetic anisotropy (PMA) of the thin film. These skyrmions can be manipulated by current-induced spin-orbit torque, which is desired for memory applications. Furthermore, we report a room-temperature skyrmion shift memory device, where individual skyrmions are controllably generated and shifted using current-induced spin-orbit torques. More importantly, electrical control of writing and addressing a stream of skyrmions is realized in the device. This prototype demonstration brings skyrmions closer to real-world computing applications.

报告人简介：

于国强，中国科学院物理研究所“特聘研究员”。2007年从吉林大学物理学院获得学士学位。于2012年7月在中国科学院物理研究所磁学国家重点实验室取得凝聚态物理学博士学位。之后在加州大学洛杉矶分校电子工程系从事博士后研究。研究兴趣包括磁性隧道结的电输运特性、自旋轨道力矩、以及拓扑磁性自旋结构斯格明子。目前已经发表44篇SCI论文，引用1500余次 (google scholar)。论著包括Nature子刊 (6篇)，Science (1篇)，Nano Letters (5篇)，PRL (1篇)，PRB (4篇)，APL (13篇)。长期担任Nature Communications，PRL，Nano Letters等期刊的审稿人。他于2017年入选中国科学院物理研究所院级“百人计划”。