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

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.

4 pages, 1 color figure

References in corpus (4)

• Solving rate equations for electron tunneling via discrete quantum states
• Magnetic Anisotropy Variations and Non-Equilibrium Tunneling in a Cobalt Nanoparticle
• Studies of spin-orbit scattering in noble-metal nanoparticles using energy level tunneling spectroscopy
• Equilibrium and non-equilibrium electron tunneling via discrete quantum states

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