Tunable Spin Filtering through an Aluminum Nanoparticle

Details Tunable Spin Filtering through an Aluminum Nanoparticle Tunable Spin Filtering through an Aluminum Nanoparticle

2008-09-12

arxiv.org/abs/0809.2239v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

12 pages 4 figures

Scientific paper

Spin-polarized current through an Al nanoparticle in tunnel contact with two ferromagnets is measured as a function of the direction of the applied magnetic field. The nanoparticle filters the spin of injected electrons along a direction specified by the magnetic field. The characteristic field scale for the filtering corresponds to a lower limit of $8ns$ for the spin-dephasing time. Spin polarized current versus applied voltage increases stepwise, confirming that the spin relaxation time is long only in the ground state and the low-lying excited states of the nanoparticle.

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