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29 March 2024
 
  » arxiv » 0911.5353

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Multiple vortex-antivortex pairs generation in magnetic nanodots
Yuri Gaididei ; Volodymyr P. Kravchuk ; Denis D. Sheka ; Franz G. Mertens ;
Date 27 Nov 2009
AbstractAn interaction of a magnetic vortex with a rotating magnetic field causes the nucleation of the vortex--antivortex pair leading to the vortex polarity switching. The key point of this process is a creation of a dip, which can be interpreted as a nonlinear resonance in the system of the certain magnon modes with nonlinear coupling. The usually observed single-dip structure is a particular case of a multidip structure. Dynamics of the structure with $n$ dips is described as a dynamics of nonlinearly coupled modes with azimuthal numbers $m=0,pm n,pm 2n$. The multidip structure with arbitrary number of vortex-antivortex pairs can be obtained in vortex-state nanodisk using a space- and time-varying magnetic field. A scheme of possible experimental setup for multidip structures generation is proposed.
Source arXiv, 0911.5353
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