Andreev Reflection in Narrow Ferromagnet/Superconductor Point Contacts

Details Andreev Reflection in Narrow Ferromagnet/Superconductor Point Contacts Andreev Reflection in Narrow Ferromagnet/Superconductor Point Contacts

2001-07-30

arxiv.org/abs/cond-mat/0107588v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4pages, 4figures

Scientific paper

10.1103/PhysRevB.65.020508

The Andreev reflection of narrow ferromagnet/superconductor point contacts is theoretically studied. We show that the conductance quantization depends on whether the contact region is superconducting or ferromagnetic as well as on the strength of the exchange field in the ferromagnet. The Andreev reflection of the ferromagnetic contact is more suppressed than that of the superconducting contact. We also show that the conductance-voltage curve has a bump at zero bias-voltage if there is no interfacial-scattering. On the contrary, the conductance-voltage curve shows a dip if the system has an interfacial-scattering.

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