Ferromagnetic Josephson switching device with high characteristic voltage

Abstract

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.

arXiv comment10 pages, 4 figures

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• Coupling of two superconductors through a ferromagnet : evidence for a pi-junction
• Implementation of superconductor-ferromagnet-superconductor pi-shifters in superconducting digital and quantum circuits
• Josephson tunnel junctions with strong ferromagnetic interlayer

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