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Planar Josephson junctions fabricated with magnesium diboride films

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9 Author(s)
D. A. Kahler ; Northrop Grumman Adv. Technol. Center, Baltimore, MD, USA ; J. Talvacchio ; J. M. Murduck ; A. Kirschenbaum
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Josephson junctions were fabricated in three planar configurations using a focused ion beam (FIB) to cut ≥70 nm gaps in MgB2 bridges. In two of the approaches - narrowed microbridges where a 0.1 μm bridge was left in place after the FIB cut or thinned microbridges where a 20-40 nm-thick film layer remained uncut - we reproduced junction results obtained by other researchers but with Ic(T)>0 at substantially higher temperatures, >32 K. Measurements were made of critical current modulation in an applied magnetic field and I-V curves were measured with the chips exposed to 1-10 GHz radiation. In the third configuration, S-N-S structures were made by filling the gap made by the FIB with a noble metal. This configuration is preferred to S-S'-S since the normal-conductor coherence length of 40-100 nm for a clean metal roughly matches the width of the FIB cut. Junction Rn measurements showed that ex-situ Au deposited after a low-energy argon ion cleaning was not as effective as in-situ Pt deposition for obtaining low-resistance S-N interfaces.

Published in:

IEEE Transactions on Applied Superconductivity  (Volume:13 ,  Issue: 2 )