Bifurcation structure and chaos in nanomagnet coupled to Josephson junction

Abstract

Recently an irregular easy axis reorientation demonstrating the Kapitza pendulum features were observed in numerical simulations of nanomagnet coupled to the Josephson junction. To explain its origin we study the magnetization bifurcations and chaos which appear in this system due to interplay of superconductivity and magnetism. The bifurcation structure of the magnetization under the variation of Josephson to magnetic energy ratio as a control parameter demonstrates several precessional motions. They are related to chaotic behavior, bistability, and multiperiodic orbits in the ferromagnetic resonance region. Effect of external periodic drive on the bifurcation structure is investigated. The results demonstrate high-frequency modes of periodic motion and chaotic response near resonance. Far from the ferromagnetic resonance we observe a quasiperiodic behavior.

9 pages, 11 figures

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Cited by in corpus (4)

• Switching current distributions in ferromagnetic anomalous Josephson junctions
• Hysteresis and chaos in anomalous Josephson junctions without capacitance
• Buzdin, Shapiro and Chimera Steps in ${\phi }_0$ Josephson Junctions. II. Bifurcation, Switching, and Hysteresis
• Resonance phenomena in a nanomagnet coupled to a Josephson junction under external periodic drive