Abstract
Magnetic core-shell cylinders comprising a hard dot and a soft ring are proposed. Due to energy redistribution, a compelled vortex is formed on the central dot. Current-driven vortex dynamics is clarified. Because of the confinement effect, the vortex-core gyrotropic motion, and further the vortex-antivortex pair mediated reversal are suppressed. Instead, the vortex-core reversal is achieved through a traveling Bloch-point mediated process. Depending on the current density, the Bloch-point-mediated reversal process adopts different modes (A-, B-, and C-modes). The switching time is a nonmonotonic function of the current density. For the 80-nm-wide cylinder, the A-mode gives a “clean” vortex-core reversal.
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