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Nano-bridges based on the superconducting MgB2thin films

Authors
Journal
Physica C Superconductivity
0921-4534
Publisher
Elsevier
Publication Date
Volume
468
Identifiers
DOI: 10.1016/j.physc.2007.11.047
Keywords
  • Mgb2
  • Superconductivity
  • Nano-Bridge
  • Fib
Disciplines
  • Physics

Abstract

Abstract 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 Δ T 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 × 10 6 A/cm 2 and no significant loss of superconducting properties was detected.

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