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 μV 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.
- Publication:
-
Applied Physics Letters
- Pub Date:
- May 2012
- DOI:
- arXiv:
- arXiv:1205.3372
- Bibcode:
- 2012ApPhL.100v2601L
- Keywords:
-
- ferromagnetic materials;
- Josephson effect;
- magnetic devices;
- magnetic switching;
- superconducting logic circuits;
- superconductor-insulator-superconductor devices;
- 85.25.Cp;
- 84.30.Sk;
- 85.25.Hv;
- Josephson devices;
- Pulse and digital circuits;
- Superconducting logic elements and memory devices;
- microelectronic circuits;
- Condensed Matter - Superconductivity
- E-Print:
- 10 pages, 4 figures