Nonlinear Dynamics in a Magnetic Josephson Junction

Abstract

We theoretically consider a Josephson junction formed by a ferromagnetic spacer with a strong spin-orbit interaction or a magnetic spin valve, i.e., a bilayer with one static and one free layer. Electron spin transport facilitates a nonlinear dynamical coupling between the magnetic moment and charge current, which consists of normal and superfluid components. By phenomenologically adding reactive and dissipative interactions (guided by structural and Onsager symmetries), we construct magnetic torques and charge pumping, whose microscopic origins are also discussed. A stability analysis of our coupled nonlinear systems generates a rich phase diagram with fixed points, limit cycles, and quasiperiodic states. Our findings reduce to the known phase diagrams for current-biased nonmagnetic Josephson junctions, on the one hand, and spin-torque driven magnetic films, on the other, in the absence of coupling between the magnetic and superconducting order parameters.

8 pages, 5 figures

References in corpus (8)

• Spin Transfer Torques
• A spin triplet supercurrent through the half-metallic ferromagnet CrO2
• Direct coupling between magnetism and superconducting current in Josephson Phi junction
• Magnetic moment manipulation by a Josephson current
• Supercurrent-Induced Magnetization Dynamics
• Interaction of a Nanomagnet with a Weak Superconducting Link
• Magnetization dynamics and Majorana fermions in ferromagnetic Josephson junctions along the quantum spin Hall edge
• Ferromagnetic resonance with a magnetic Josephson junction

Cited by in corpus (7)

• Spin-polarized supercurrents for spintronics: a review of current progress
• Possible evidence for spin-transfer torque induced by spin-triplet supercurrent
• Anomalous Gilbert Damping and Duffing Features of the SFS {\boldmath ${\phi }_0$} Josephson Junction
• Magnetic Flux Pumping in Superconducting Loop Containing a Josephson $\psi$ Junction
• Spin-torque ac impedance in magnetic tunnel junctions
• Collective magnetic and plasma excitations in Josephson $\psi$ junctions
• Spin-transfer torque switching in nanopillar superconducting-magnetic hybrid Josephson junctions