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TT: Fachverband Tiefe Temperaturen

TT 15: SC: Fabrication and Characterization

TT 15.4: Talk

Monday, March 14, 2011, 17:15–17:30, HSZ 301

Fabrication of superconducting MgB₂ thin films by magnetron co-sputtering on (001) MgO substrates — •Savio Fabretti, Patrick Thomas, Markus Meinert, and Andy Thomas — Bielefeld University, Germany

We fabricated superconducting MgB₂ thin films on (001) MgO substrates. The samples were prepared by magnetron rf and dc co-sputtering on heated substrates. They were annealed ex-situ for one hour at temperatures between 450^∘C and 750^∘C. We will show that the substrate temperature during the sputtering process and the post annealing temperatures play a crucial role in forming MgB₂ superconducting thin films. We achieved a critical onset temperature of 27.1 K for a film thickness of 30 nm. The crystal structures were measured by x-ray diffraction.