Dresden 2009 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 32: Postersession Superconductivity: Josephson Junctions, SQUIDs, Heterostructures, Andreev Scattering, Vortex Physics, Cryodetectors, Measuring Devices, Cryotechnique

TT 32.18: Poster

Mittwoch, 25. März 2009, 14:00–18:00, P1A

Angle-dependent investigation of the upper critical field in NbN/Sm-Co bilayers — •Jan Engelmann, Silvia Haindl, Ludwig Schultz, and Bernhard Holzapfel — IFW Dresden, Institute for Metallic Materials, P.O. Box 270116, D-01171 Dresden, Germany

The coexistence of superconductivity and magnetism leads to new interesting phenomena like domain-, domain-wall-superconductivity and stray field effects. To investigate thin film bilayers of hard-magnetic Sm-Co with very fine defined domain structure and superconducting NbN, we fabricated these bilayers using pulsed laser deposition. The Sm-Co thin film layer was prepared in UHV on a MgO(100)-substrate with a Cr-buffer, and subsequently the NbN was grown in a nitrogen-atmosphere. Epitaxy and texture were measured via x-ray diffraction, the magnetic properties were determined by VSM -measurements. The angle-dependent upper critical field, µ₀H_c2, of the bilayer was investigated in detail by a standard four probe technique using a PPMS.