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TT: Fachverband Tiefe Temperaturen

TT 9: SC: Poster Session

TT 9.48: Poster

Montag, 22. März 2010, 14:00–18:00, Poster A

The influence of magnetic stray field on the critical current in NbN/SmCo₅-bilayers — •Jan Engelmann, Silvia Haindl, Ingolf Moench, Ludwig Schultz, and Bernhard Holzapfel — IFW Dresden, P. O. Box 27 01 16, 01171 Dresden, Germany

The coexistence of superconductivity (sc) and ferromagnetism (fm) in artificially grown heterostructures, sc/fm-bilayers in the simplest case, leads to new interesting phenomena like field compensation- and stray field effects. The intermetallic permanent magnet SmCo₅ is especially known for its large magnetic anisotropy energy. Thin films of SmCo₅ have been prepared with extremely high coercivity fields up to 3 T (at room temperature) and up to 5 T at 10 K. To investigate the influence of the magnetic stray field on a conventional superconductor, 50 nm NbN layers have been grown on SmCo₅ thin films using pulsed laser deposition (PLD). The magnetic properties were determined by VSM and MFM measurements. Critical current measurements were made by a standard four-probe technique. The angular-dependent critical current has been investigated.