Non-local current correlations in ferromagnet/superconductor nanojunctions

Details Non-local current correlations in ferromagnet/superconductor nanojunctions Non-local current correlations in ferromagnet/superconductor nanojunctions

2003-10-17

arxiv.org/abs/cond-mat/0310414v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Published in 'Towards The Controllable Quantum States (Mesoscopic Superconductivity and Spintronics)', 119-125, Eds H. Takayan

Scientific paper

When two fully polarized ferromagnetic (F) wires with opposite polarizations make contact with a spin-singlet superconductor, a potential-induced current in wire 1 induces a non-local current of equal magnitude and sign in wire 2. The magnitude of this current has been studied in the tunneling limit and found to decay exponentially with the distance between the contact. In this paper we propose a new structure in which this novel non-local effect is increased by orders of magnitude. We study the spin-dependent electronic transport of a diffusive nanojunction and demonstrate that when a normal diffusive region is placed between the F leads and superconductor, the non-local initially increases with the separation between the F leads, achieving a maximum and decays as a power law with increasing separation.

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