Tunneling Via Individual Electronic States in Ferromagnetic Nanoparticles

Details Tunneling Via Individual Electronic States in Ferromagnetic Nanoparticles Tunneling Via Individual Electronic States in Ferromagnetic Nanoparticles

1999-04-17

arxiv.org/abs/cond-mat/9904248v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures. Improved by comments from referees, to appear in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.83.4148

We measure electron tunneling via discrete energy levels in ferromagnetic cobalt particles less than 4 nm in diameter, using non-magnetic electrodes. Due to magnetic anisotropy, the energy of each tunneling resonance shifts as an applied magnetic field rotates the particle's magnetic moment. We see both spin-increasing and decreasing tunneling transitions, but we do not observe the spin degeneracy at small magnetic fields seen previously in non-magnetic materials. The tunneling spectrum is denser than predicted for independent electrons, possibly due to spin-wave excitations.

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