Zero-Field Fiske Resonance Coupled with Spin-waves in Ferromagnetic Josephson Junctions
arXiv:1306.3652 · doi:10.7566/JPSJ.83.074704
Abstract
AC Josephson current density in a Josephson junction with DC bias is spatially modulated by an external magnetic field, and induces an electromagnetic (EM) field inside the junction. The current-voltage (-) curve exhibits peaks due to the resonance between the EM field and the spatially modulated AC Josephson current density. This is called {\it Fiske resonance}. Such a spatially modulated Josephson current density can be also induced by a non-uniform insulating barrier and the Fiske resonance appears without external magnetic field. This is called zero-field Fiske resonance (ZFFR). In this paper, we theoretically study the ZFFR coupled with spin-waves in a superconductor/ferromagnetic insulator/superconductor junction (ferromagnetic Josephson junction) with a non-uniform ferromagnetic insulating barrier. The resonant mode coupled with spin-waves can be induced without external magnetic field. We find that the - curve shows resonant peaks associated with composite excitations of spin-waves and the EM field in the junction. The voltage at the resonance is obtained as a function of the normal modes of EM field. The ZFFRs coupled with spin-waves are found as peak structures in the DC Josephson current density as a function of bias voltage.
10 pages, 3 figures
References in corpus (7)
- Critical Current Oscillations in Strong Ferromagnetic Pi-Junctions
- Magnetic moment manipulation by a Josephson current
- Resonant electromagnetic emission from intrinsic Josephson-junction stacks with laterally modulated Josephson critical current
- Spin dynamics in a superconductor / ferromagnet proximity system
- Macroscopic quantum dynamics of pi-junctions with ferromagnetic insulators
- Interaction of Josephson and magnetic oscillations in Josephson tunnel junctions with a ferromagnetic layer
- FMR induced Josephson Current in a Superconductor/Ferromagnet/Superconductor Junction