We develop a fast Magnetic Josephson Junction (MJJ) - a superconductingferromagnetic device for a scalable high-density cryogenic memory compatible inspeed and fabrication with energy-efficient Single Flux Quantum (SFQ) circuits.We present experimental results forSuperconductor-Insulator-Ferromagnet-Superconductor (SIFS) MJJs with highcharacteristic voltage IcRn of >700 uV proving their applicability forsuperconducting circuits. By applying magnetic field pulses, the device can beswitched between MJJ logic states. The MJJ IcRn product is only ~30% lower thanthat of conventional junction co-produced in the same process, allowing forintegration of MJJ-based and SIS-based ultra-fast digital SFQ circuitsoperating at tens of gigahertz.
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