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

Tunable Spin Filtering through an Aluminum Nanoparticle