Tunable Spin Filtering through an Aluminum Nanoparticle

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 scal...

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Bibliographic Details
Published in:arXiv.org 2008-09
Main Authors: Birk, F T, Malec, C E, Davidovic, D
Format: Article
Language:English
Subjects:
Aluminum
Electron spin
Ferromagnetism
Filtration
Magnetic fields
Magnetism
Nanoparticles
Relaxation time
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Summary: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.
ISSN:2331-8422