Abstract: Three spin polarized currents with the direction of (-1,1-1) were passed through the nanometer disk. The effects of the magnitude and position of the spin polarized currents on the dynamical behavior of magnetic vortex were analyzed by OOMMF 
(object oriented micromagnetic framework） software. The results show that the  position of the maximum velocity on the trajectory is relatively fixed when the magnetic vortex core experiences gyrotropic motion. According to this property, we can import defect at the position of the maximum velocity, moving to which the magnetic vortex core can be pinned and 
inverted, thus realizing the controllable polarity switching of the magnetic vortex core. The frequency of the gyrotropic motion of the magnetic vortex core can be adjusted by changing the magnitude and position of the spin polarized currents. The chirality switching of the magnetic vortex at the region of high current density, and the inversion time is shorter. Compared with the symmetrical position of polarized currents, the current range of chirality switching is enlarged and the time to the transient state is shortened with the asymmetrical current position.

Key words: magnetic vortex, spin polarized current, gyrotropic motion, chirality switching