Submillimeter wave response of tunnel junctions with an insulating barrier containing magnetic impurities
Abstract
The photon-assisted-tunneling (PAT) effect induced by a submillimeter wave (SMMW) in superconductor-insulator-superconductor (SIS) point-contact junctions (Nb-NiOx-Sn) with an insulating barrier containing magnetic impurities at high density (a magnetic barrier) is investigated. It is shown that the junctions have severely suppressed dc and ac Josephson currents and that they respond well to the SMMW of frequency 428.6 GHz and 525.4 GHz, showing that they have very high RC-cutoff frequency. This indicates that the magnetic barrier, NiOx, can suppress the Josephson currents even when they are thin enough to have f(c) in the SMMW region. It is concluded that the junctions have potential for a high-frequency PAT mixer.
- Publication:
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IEEE Transactions on Magnetics
- Pub Date:
- March 1985
- DOI:
- Bibcode:
- 1985ITM....21..906I
- Keywords:
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- Contact Potentials;
- Insulators;
- Magnetic Materials;
- Sis (Superconductors);
- Submillimeter Waves;
- Tunnel Diodes;
- Volt-Ampere Characteristics;
- Nickel Oxides;
- Niobium Stannides;
- Electronics and Electrical Engineering