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A phase diagram of the magnetization dynamics is studied by numericallysolving the Landau-Lifshitz-Gilbert (LLG) equation in a spin torque oscillatorconsisting of asymmetric two free layers that are magnetized in in-planedirection. We calculated the dynamics for a wide range of current density forboth low and high field cases, and found many dynamical phases such assynchronization, auto-oscillation with different frequencies, and chaoticdynamics. The observation of the synchronization indicates the presence of adynamical phase which has not been found experimentally by using theconventional electrical detection method. The auto-oscillations with differentfrequencies lead to an oscillation of magnetoresistance with a high frequency,which can be measured experimentally. The chaotic and/or periodic behavior ofmagnetoresistance in a high current region, on the other hand, leads to adiscontinuous change of the peak frequency in Fourier spectrum.

Synchronized, periodic, and chaotic dynamics in spin torque oscillator with two free layers