Regensburg 2007 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 8: Superconductivity - Poster Session
TT 8.27: Poster
Monday, March 26, 2007, 14:00–17:45, Poster A
Enhanced stray field compensation in Nb/FePt bilayers — •Silvia Haindl, Martin Weisheit, Sebastian Fähler, Ludwig Schultz, and Bernhard Holzapfel — Institute for Metallic Materials, IFW, Postfach 27 01 16, 01171 Dresden, Germany
Epitaxial Nb/FePt thin film bilayers were prepared by pulsed laser deposition under UHV conditions. FePt is a highly coercive ferromagnet and therefore shows no switching in the field range of the superconducting phase at low temperatures. With the magnetic moments of the FePt grains aligned perpendicular to the film plane, the stray field between the individual grains acts already on the superconductor in the field-free case. Under application of a magnetic field, the stray field can be compensated, accompanied by an observable increase of the transition temperature. Using hard magnetic materials an enhanced effect of stray field compensation was observed when 0.25 T of applied field raises TC about 0.5 K. The B(T)-phase diagram of the heterostructures was investigated, and its behavior was controlled by varying the FePt layer thickness.