Using single quantum states as spin filters to study spin polarization in ferromagnets

Details Using single quantum states as spin filters to study spin polarization in ferromagnets Using single quantum states as spin filters to study spin polarization in ferromagnets

2002-07-13

arxiv.org/abs/cond-mat/0207333v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 1 color figure

Scientific paper

10.1103/PhysRevLett.89.266803

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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