Nb/CuNi Sandwiches as Superconducting Spin-Valve Core Structures

Details Nb/CuNi Sandwiches as Superconducting Spin-Valve Core Structures Nb/CuNi Sandwiches as Superconducting Spin-Valve Core Structures

2005-05-05

arxiv.org/abs/cond-mat/0505124v1

Physics

Condensed Matter

Superconductivity

Accepted as Rapid Communication in Phys Rev B

Scientific paper

We have investigated CuNi/Nb/CuNi trilayers, as have been recently used as the core structure of a spin-valve like device [J. Y. Gu et al., Phys. Rev. Lett. 89, 267001 (2002)] to study the effect of magnetic configurations of the CuNi layers on the critical temperature, Tc, of the superconducting Nb. After reproducing a Tc shift of a few mK, we have gone on to explore the performance limits of the structure. The results showed the Tc shift we found to be quite close to the basic limits of this particular materials system. The ratio between the thickness and the coherence length of the superconductor and the interfacial transparency were the main features limiting the Tc shift.

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