Chaotic Vortex Dynamics in Circular Magnetic Nanodisk with Double Disk Structure Induced by AC Magnetic Field

Generating chaos in spintronics devices has attracted much attention for the application of physical reservoir computing. We theoretically investigate the influence of the potential deformation due to the nanodisk structure on the magnetic vortex core dynamics in circular magnetic nanodisk. Considering a circular magnetic nanodisk with an additional disk, we numerically calculate the magnetic vortex dynamics using the Thiele equation. The deformation potential is modeled by using micromagnetic simulation. The chaos is induced by applying an AC magnetic field to the nanodisk with only an additional disk. In contrast, chaos disappears when the AC magnetic field is applied to a nanodisk without an additional disk.