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Ultrafast Reversal of Vortex Cores Confined in a Spin-Wave Potential Well
Dong Xinwei 1,Wang Zhenyu 2,Wang Ruifang 2 * #
1.Department of physics, Xiamen University, FuJian Xiamen 361005
2.Department of physics, Xiamen University, Xiamen 361005
*Correspondence author
#Submitted by
Funding: National Natural Science Foundation of China under Grant (No.No. 11174238, 10974163 and 11204255), Specialized Research Fund for the Doctoral Program of Higher Education in China(No.No. 20090121120029)
Opened online:18 March 2013
Accepted by: none
Citation: Dong Xinwei,Wang Zhenyu,Wang Ruifang.Ultrafast Reversal of Vortex Cores Confined in a Spin-Wave Potential Well[OL]. [18 March 2013] http://en.paper.edu.cn/en_releasepaper/content/4528013
A spin-wave potential well is created in permalloy nanodisks by setting up a cylindrical cavity in the center of the sample. We then apply single harmonic external magnetic field perpendicular to the disk plane in order to switch the vortex polarity of the sample. Our micromagnetic numerical studies find out that the effective spin-wave confinement by the potential well leads to much stronger magnetization oscillation in the sample. Therefore the vortex core can be reversed well below 200 ps and over wide range of field frequency. Our findings present an additional efficient means for the ultrafast switching of magnetic vortex.
Keywords:magnetic vortex; spin wave; spin dynamics

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