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Nano-bridges based on the superconducting MgB2 thin films

✍ Scribed by M. Gregor; R. Mičunek; T. Plecenik; T. Roch; A. Lugstein; E. Bertagnolli; I. Vávra; M. Štefečka; M. Kubinec; M. Leporis; V. Gašparík; P. Kúš; A. Plecenik

Publisher
Elsevier Science
Year
2008
Tongue
English
Weight
275 KB
Volume
468
Category
Article
ISSN
0921-4534

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✦ Synopsis

Precursor MgB thin films were prepared on sapphire substrates by magnetron sputtering. Influence of the ex situ annealing process on the roughness of the superconducting MgB 2 thin films is discussed. Optimized annealing process of MgB precursor thin films in vacuum results in smooth superconducting MgB 2 thin films with roughness below 10 nm, critical temperature T con = 31 K and transition width DT c less than 1 K. Nano-bridges based on the superconducting MgB 2 thin films using optical and focused ion beam lithography were prepared. Critical current density j c (4.2 K) measured on 50 nm wide strip was 7.3 Â 10 6 A/cm 2 and no significant loss of superconducting properties was detected.

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