Superconducting and Magnetic Properties of Nb/Pd1-xFex/Nb Triple Layers
M. Schoeck, C. Suergers, H. v. Loehneysen
Abstract
The superconducting and magnetic properties of Nb/Pd1-xFex/Nb triple layers with constant Nb layer thickness dNb=200 A and different interlayer thicknesses are investigated. The thickness dependence of the magnetization and of the superconducting transition temperature shows that for small iron concentration x the Pd1-xFex layer is likely to be in the paramagnetic state for very thin films whereas ferromagnetic order is established for x>=0.13. The parallel critical field Bc2II(T) exhibits a crossover from two-dimensional (2D) behavior where the Nb films are coupled across the interlayer, towards a 2D behavior of coupled Nb films with increasing dPdFe or x. This 2D-2D crossover allows a determination of the penetration depth xiF of Cooper pairs into the Pd1-xFex layer as a function of x. For samples with a ferromagnetic interlayer xi is found to be independent of x.
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