Investigation of the effect of the thickness of a non-magnetics layer on the associated dynamics of magnetic vortices in a spin-transfer nanoscillator

The effect of the thickness of a non-magnetic layer and the magnitude of the spin-polarized current on the coupled dynamics of two magnetic vortices in a spin-transfer nanoscillator is investigated. A spin-transfer nanoscillator in the form of a three–layer conductive cylinder with a diameter of 200 nm is considered. The features of the dynamics of vortex motion for three different thicknesses of a non-magnetic layer are studied. It is shown that in all three cases of thickness of a non-magnetic layer, depending on the magnitude of the current, three dynamic modes are observed: the mode of damped oscillations of magnetic vortices, the mode of stationary coupled oscillations of magnetic vortices, the mode of dynamic switching of the polarity of the vortex in a thin magnetic layer. The frequency of stationary oscillations is weakly dependent on the thickness of the non-magnetic layer. An increase in the thickness of the non-magnetic layer leads to a decrease in the magnitude of the first critical current, while the magnitude of the second critical current remains practically unchanged. This effect can be used to increase the current area of the stationary mode of coupled oscillations of PP vortices, which is important for practical applications.