Buzdin, Shapiro and Chimera Steps in ${\phi }_0$ Josephson Junctions. II. Bifurcation, Switching, and Hysteresis

Abstract

The dynamics of magnetization and current-voltage characteristics of the superconductor-ferromagnet-superconductor ${\phi }_0$ Josephson junction in the presence of external electromagnetic radiation have been studied. Effects of radiation magnetic component are investigated in the frameworks of one- and two-signal models. The implementation of two types of dynamical states of magnetization is demonstrated. These states have a phase shift of $\pi$ in the synchronization region of magnetic precession and Josephson oscillations and differ in the nature of their time dependence. Transitions between these states with increasing and decreasing bias current show hysteresis, which is reflected in the bifurcation diagram and the current-voltage characteristics. We also provide an experimental way to test the obtained results by measuring the phase shift in voltage temporal dependence at fixed current value for both sweeping directions. The results obtained can find application in various fields of superconducting spintronics and quantum computing.

11 pages, 10 figures and 3 pages for supplemental with 4 figures

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• Originality of resonance and locking phenomena in SFS ${\phi }_0$ Josephson junction