Joint Effect of a Magnetic Field and a Spin-Polarized Current on the Coupled Dynamics of Magnetic Vortices in a Spin-Transfer Nano-Oscillator

Joint Effect of a Magnetic Field and a Spin-Polarized Current on Polarity Switching of Magnetic Vortices in a Spin-Transfer Nanooscillator

“…For STNO with diameter of 200 nm, the critical magnetic field of polarity switching for vortex in thin and thick layers is practically independent of the current value and is approximately 2600 and 3400 Oe, respectively. For the case of high currents, when the current value exceeds the critical value [15,16], sufficient to start the dynamic mechanism of the vortex polarity switching in thick layer, the dependence on the current of the magnetic field that switches the vortex polarity in a thin layer is similar to the case of low currents. And the process of vortex polarity switching in thick layer becomes much more complicated.…”

“…The additional torque of equation (1) depends linearly on the current density and its polarization and consists of two components: parallel and perpendicular to the plane (M, m re f ), where m re funit vector along the magnetization in another magnetic layer. For the numerical calculation of the coupled dynamics of magnetic vortices, the software package for micromagnetic modeling SpinPM [15,16] was used. We will study the dynamics of two coupled magnetic vortices with the same polarity (P-vortices) and chirality that exist at the initial time in each magnetic layer.…”