Abstract

We have fabricated microstrips of Nb thin films by dc magnetron sputtering and lift-off. Focused ion beam (FIB) has been used to mill the surface of the films in a nanometer-sized region across the width of the strip. FIB has the side effect of implanting Ga+ ions on the exposed surface of Nb, damaging the film and modifying its superconducting properties. To overcome this problem, the surface of the FIB-milled Nb films has been passivated by anodization, including the damaged region of the strip into the oxidized layer. Anodization also allows for finely tuning the thickness of the nanoconstrictions after the milling process. We report here the effect of FIB exposure and anodization voltage on the superconducting transition temperature and on the temperature dependence of the resistance of the Nb nanoconstric- tions. We also show some preliminary results suggesting that these devices behave as overdamped SNS-like Josephson junctions.

Autore Pugliese

• Maggi Sabino

Tutti gli autori

• De Leo N.; Fretto M. ; Lacquaniti V. ; Cassiago C. ; D'Ortenzi L.; Boarino L.; Maggi S.

Titolo volume/Rivista

IEEE transactions on applied superconductivity

Anno di pubblicazione

2016

ISSN

1051-8223

ISBN

Non Disponibile

Numero di citazioni Wos

Nessuna citazione

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Numero di citazioni Scopus

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Settori ERC

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Codici ASJC

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