Nonlinear features of the superconductor–ferromagnet–superconductor φ₀ Josephson junction in the ferromagnetic resonance region

Abstract

We demonstrate the manifestations of nonlinear features in magnetic dynamics and I–V characteristics of a φ0 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. Shifting of the ferromagnetic resonant frequency and the reversal of its damping dependence due to nonlinearity are demonstrated by the full Landau–Lifshitz–Gilbert–Josephson system of equations and in its different approximations. Finally, we demonstrate the negative differential resistance in the I–V characteristics and its correlation with the fold-over effect.

Frontiers of nanoelectronics: intrinsic Josephson effect and prospects of superconducting spintronics

“…• The magnetic proximity effect at a ferromagnetic-insulator-superconductor (FIS) interface was investigated through combined experimental and theoretical work [25]. • Manifestations of nonlinear features in magnetic dynamics and current-voltage characteristics of the 0 Josephson junction in superconductor-ferromagnet-superconductor (SFS) structures have been predicted and calculated [26]. • A quantitative study of the density of states (DOS) in bulk superconductor/ferromagnetic (S/F) bilayers in the diffusive limit has been presented.…”

“…Manifestations of nonlinear features in magnetic dynamics and current–voltage characteristics of the 0 Josephson junction in superconductor–ferromagnet–superconductor (SFS) structures have been predicted and calculated [ 26 ].…”