Numerical study on the magnetization dynamics of a SAF under perpendicular spin-polarized current

By solving the Landau-Lifschitz-Gilbert equation in the macrospin approach we have analysed the free-layer magnetization dynamics of a perpendicular polarizer - planar SAF free layer spin-torque oscillator at 0K temperature. The current-field state diagram obtained exhibits three different behaviors: a stable in-plane alignment of the two SAF´s layers magnetizations for low current densities (J); an incoherent dynamics state for large J and a dynamic state where simultaneous out-of-plane magnetization precessions of the two SAF layers occur for vast ranges of fields and currents. This large dynamical region is very interesting for applications.