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Regensburg 2010 – wissenschaftliches Programm

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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.

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