Coupling superconducting-ferromagnetic point contacts by Andreev reflections

Guy Deutscher, Denis Feinberg

Research output: Contribution to journalArticlepeer-review


The properties of a device made of two point contacts between normal (N) or ferromagnetic (F) tips, and a superconductor (S), are discussed as a function of the spin polarization and the distance L between the contacts. When L is smaller than the superconductor coherence length ξ, nonlocal Andreev reflections occur: for opposite spin polarizations of the contacts, "mixed" Cooper pairs made of electrons coming one from each tip can be injected into the superconductor. This leads to unusual properties, for instance, the parallel resistance of two S/F contacts goes from infinity for full and equal polarizations, to a finite Andreev value for opposite ones.

Original languageEnglish
Pages (from-to)487-489
Number of pages3
JournalApplied Physics Letters
Issue number4
StatePublished - 24 Jan 2000


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