报告题目：New Opportunities for Spintronics: Magnetic Skyrmions
报告人：    Prof. Axel Hoffmann
报告人单位：Argonne National Laboratory, Argonne, IL 60439, USA
报告时间：  2016年5月11日（星期三） 15:30-17:30 PM
地    点： 中国科学院物理研究所 D楼二层210报告厅
 
报告摘要：
An exciting new development in spintronics [1] are magnetic skyrmions, which are topologically distinct spin textures.  Magnetic skyrmions exhibit quasi-particle like behavior and can be manipulated with very low electric currents.  Thus it is envisioned that data in low power information technologies could be encoded in topological charges.  Towards this goal we demonstrated at room temperature stable magnetic skyrmions in magnetic heterostructures.  Using inhomogeneous charge currents allows the generation of skyrmions in a process that is remarkably similar to the droplet formation in surface-tension driven fluid flows [2].  Detailed micromagnetic simulations show that there are at least two regimes with different skyrmion formation mechanisms [3].  Lastly, we demonstrated that the topological charge gives rise to a transverse motion on the skyrmions, i.e., the skyrmion Hall effect [4].
This work was supported by the U.S. Department of Energy, Office of Science, Materials Sciences and Engineering Division. 
References
[1] A. Hoffmann & S. D. Bader, Phys. Rev. Appl. 4 (2015) 047001.
[2] W. Jiang, et al., Science 349 (2015) 283.
[3] O. Heinonen, et al., Phys. Rev. B 93 (2016) 094407.
[4] W. Jiang, et al., arXiv:1603.07393
 
报告人简历：
Prof. Axel Hoffmann is the Senior Group Leader of the Magnetic Films Group at the Argonne National Laboratory.  He is a fellow of the American Physical Society and IEEE. In 2011 he was a Distinguished Lecturer for the IEEE Magnetics Society and in 2015 he received the Outstanding Researcher Award by the Prairie Section of the American Vacuum Society.