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Abstract: The interaction of a magnetic vortex with a rotating magnetic field causesthe nucleation of a vortex-antivortex pair leading to a vortex polarityswitching. The key point of this process is the creation of a dip, which can beinterpreted as a nonlinear resonance in the system of certain magnon modes withnonlinear coupling. The usually observed single-dip structure is a particularcase of a multidip structure. The dynamics of the structure with $n$ dips isdescribed as the dynamics of nonlinearly coupled modes with azimuthal numbers$m=0,\pm n,\pm 2n$. The multidip structure with arbitrary number of vortexantivortex pairs can be obtained in vortex-state nanodisk using a space- andtime-varying magnetic field. A scheme of a possible experimental setup formultidip structure generation is proposed.



Autor: Yuri Gaididei, Volodymyr P. Kravchuk, Denis D. Sheka, Franz G. Mertens

Fuente: https://arxiv.org/







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