Nonlinear features of the superconductor-ferromagnet-superconductor φ Josephson junction in the ferromagnetic resonance region.

We demonstrate the manifestations of nonlinear features in magnetic dynamics and - characteristics of a φ Josephson junction in the ferromagnetic resonance region. We show that at small values of the system parameters damping, spin-orbit interaction, and Josephson-to-magnetic energy ratio, the magnetic dynamics is reduced to the dynamics of a scalar Duffing oscillator driven by the Josephson oscillations. The role of the increasing superconducting current in the resonance region is clarified.