Using Single Quantum States as Spin Filters to Study Spin Polarization in Ferromagnets

Deshmukh, Mandar M. ; Ralph, D. C. (2002) Using Single Quantum States as Spin Filters to Study Spin Polarization in Ferromagnets Physical Review Letters, 89 (26). ISSN 0031-9007

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Official URL: http://doi.org/10.1103/PhysRevLett.89.266803

Related URL: http://dx.doi.org/10.1103/PhysRevLett.89.266803

Abstract

By measuring electron tunneling between a ferromagnet and individual energy levels in an aluminum quantum dot, we show how spin-resolved quantum states can be used as filters to determine spin-dependent tunneling rates. We also observe magnetic-field-dependent shifts in the magnet’s electrochemical potential relative to the dot’s energy levels. The shifts vary between samples and are generally smaller than expected from the magnet’s spin-polarized density of states. We suggest that they are affected by field-dependent charge redistribution at the magnetic interface.

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ID Code:117666
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