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By measuring electron tunneling between a ferromagnet and individual energylevels in an aluminum quantum dot, we show how spin-resolved quantum states canbe used as filters to determine spin-dependent tunneling rates. We also observemagnetic-field-dependent shifts in the magnet's electrochemical potentialrelative to the dot's energy levels. The shifts vary between samples and aregenerally smaller than expected from the magnet's spin-polarized density ofstates. We suggest that they are affected by field-dependent chargeredistribution at the magnetic interface.Comment: 4 pages, 1 color figur

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