Abstract
An interesting type of skyrmion-like spin texture, 2 pi-vortex, is obtained in a thin nano-disk with Dzyaloshinskii-Moriya interaction. We have simulated the existence of 2 pi-vortex by micromagnetic method. Furthermore, the spin polarized current is introduced in order to drive the motion of 2 pi-vortex in a nano-disk with diameter 2R = 140 nm. When the current density matches with the current injection area, 2p-vortex soon reaches a stable precession (3 similar to 4 ns). The relationship between the precession frequency of 2 pi-vortex and the current density is almost linear. It may have potential use in spin torque nano-oscillators. (C) 2015 Author(s).