Rotational motion of a magnetic vortex in a circular disk induced by injection of an electric current through an off-centered point contact

The dynamics of a magnetic vortex in a circular disk with an off-centered point contact is theoretically studied based on Thiele's equation and two-vortices model. It is shown that the steady-state rotational motion of a vortex core is induced by an electric current, and the threshold current of this rotational motion increases as the distance between the point contact and the center of the disk increases. The increase rate of the threshold current depends on the curling of the vortex because the Oersted field acts as an attractive or repulsive force between the vortex core and the point contact, depending on the curling of the vortex.