Ferromagnetic Josephson switching device with high characteristic   voltage
  We develop a fast Magnetic Josephson Junction (MJJ) - a superconducting ferromagnetic device for a scalable high-density cryogenic memory compatible in speed and fabrication with energy-efficient Single Flux Quantum (SFQ) circuits. We present experimental results for Superconductor-Insulator-Ferromagnet-Superconductor (SIFS) MJJs with high characteristic voltage IcRn of >700 uV proving their applicability for superconducting circuits. By applying magnetic field pulses, the device can be switched between MJJ logic states. The MJJ IcRn product is only ~30% lower than that of conventional junction co-produced in the same process, allowing for integration of MJJ-based and SIS-based ultra-fast digital SFQ circuits operating at tens of gigahertz. 
T.I. Larkin, V.V. Bol'ginov, V.S. Stolyarov, V.V. Ryazanov, I.V.   Vernik, S.K. Tolpygo, and O.A. Mukhanov
cond-mat.supr-con