Direct demonstration of decoupling of spin and charge currents in nanostructures

Details Direct demonstration of decoupling of spin and charge currents in nanostructures Direct demonstration of decoupling of spin and charge currents in nanostructures

2006-02-06

arxiv.org/abs/cond-mat/0602139v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

13 pages, 3 figures; accepted for publication in Nano Letters

Scientific paper

The notion of decoupling of spin and charge currents is one of the basic principles underlying the rapidly expanding feld of Spintronics. However, no direct demonstration of the phenomenon exists. We report a novel measurement, in which a non-equilibrium spin population is created by a point-like injection of current from a ferromagnet across a tunnel barrier into a one dimensional spin channel, and detected differentially by a pair of ferromagnetic electrodes placed symmetrically about the injection point. We demonstrate that the spin current is strictly isotropic about the injection point and, therefore, completely decoupled from the uni-directional charge current.

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