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TT: Fachverband Tiefe Temperaturen

TT 64: Superconductivity: Heterostructures, Andreev Scattering, Vortex Physics

TT 64.4: Vortrag

Donnerstag, 14. März 2013, 15:45–16:00, H21

Proximity effect in ferromagnet-superconductor heterostructures with noncollinear magnetisation — •Daniel Fritsch and James F. Annett — H. H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol BS8 1TL, United Kingdom

At the interface between a normal metal and a superconductor (SC) the proximity effect allows the (singlet pair) superconducting properties to leak into the normal metal side of the interface. Replacing the normal metal by a ferromagnet (FM) it has been found that unusual triplet pairs can form, which have been shown to decay much further into the metallic side compared to the singlet pairs [1]. This is called the long-range proximity effect.

To study the effects of triplet pair generation in the vicinity of a FM/SC interface we present results based on numerical solutions of the Bogoliubov - de Gennes equations, including spin-orbit coupling and noncollinear magnetisations. We use the calculated pairing amplitude and local density of states to obtain information about relevant proximity length depending on system size and exchange fields.
[1] J. W. A. Robinson, J. D. S. Witt, and M. G. Blamire, Science 329, 59 (2010).