Tunable Spin Filtering through an Aluminum Nanoparticle

Birk, F. T.; Malec, C. E.; Davidovic, D.

Tunable Spin Filtering through an Aluminum Nanoparticle

Authors

Birk, F. T.

Malec, C. E.

Davidovic, D.

Description

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.
12 pages 4 figures