nanobridges were fabricated by e-beam lithography and Ar-ion beam milling. Nanobridges of widths ranging from 60 nm to and in length were realized by Ar-ion beam milling using amorphous carbon as etching mask. The processing did not harm the superconducting properties appreciably. High values of the critical current density, more than , were measured for bridges with widths down to 60 nm. Current-voltage characteristics showed a behavior typical of a bridge going normal, after the critical current is exceeded, and remaining normal as the current is decreased to a lower switch back value due to Joule heating. We could also observe switching behavior in some bridges indicating formation of normal hotspots in the bridges before they returned to their superconducting state. Alternative explanations may include natural grain boundaries in the film or the movement of Abrikosov vortices. The current-voltage characteristics showing critical current densities up to indicates excellent film properties in the nanobridges.
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15 December 2005
Research Article|
December 20 2005
Magnesium diboride nanobridges fabricated by electron-beam lithography
A. Malisa;
A. Malisa
a)
Department of Microtechnology and Nanoscience, Quantum Device Physics Laboratory,
Chalmers University of Technology
, SE-412 96 Göteborg, Sweden
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S. Charlebois;
S. Charlebois
Department of Microtechnology and Nanoscience, Quantum Device Physics Laboratory,
Chalmers University of Technology
, SE-412 96 Göteborg, Sweden and Département de Génie Electrique et de Génie Informatique, Faculté de Génie, Universitè de Sherbrooke
, Sherbrooke (Québec) J1K 2R1, Canada
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T. Lindström
T. Lindström
Department of Microtechnology and Nanoscience, Quantum Device Physics Laboratory,
Chalmers University of Technology
, SE-412 96 Göteborg, Sweden
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a)
Author to whom correspondence should be addressed; electronic mail: Anayesu.Malisa@mc2.chalmers.se
J. Appl. Phys. 98, 124305 (2005)
Article history
Received:
February 22 2005
Accepted:
November 07 2005
Citation
A. Malisa, S. Charlebois, T. Lindström; Magnesium diboride nanobridges fabricated by electron-beam lithography. J. Appl. Phys. 15 December 2005; 98 (12): 124305. https://doi.org/10.1063/1.2142095
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