Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2009-11-27
Phys. Rev. B 81, 094431 (2010)
Physics
Condensed Matter
Strongly Correlated Electrons
12 pages, 7 figures
Scientific paper
10.1103/PhysRevB.81.094431
The interaction of a magnetic vortex with a rotating magnetic field causes the nucleation of a vortex--antivortex pair leading to a vortex polarity switching. The key point of this process is the creation of a dip, which can be interpreted as a nonlinear resonance in the system of certain magnon modes with nonlinear coupling. The usually observed single-dip structure is a particular case of a multidip structure. The dynamics of the structure with $n$ dips is described as the 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 a possible experimental setup for multidip structure generation is proposed.
Gaididei Yuri
Kravchuk Volodymyr P.
Mertens Franz G.
Sheka Denis D.
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