Theory of Tunneling Spectroscopy in Ferromagnetic Nanoparticles.
Carlo Canali
Abstract
We present a theory of the the low-energy excitations of a
ferromagnetic metal nanoparticle. In addition to the
particle-hole excitations, which occur in a paramagnetic metal
nanoparticle, we predict a branch of excitations involving the
magnetization-orientation collective coordinate.
Tunneling matrix elements are in general sizable for several
different collective states associated with the same band
configuration. We point out that the average change in
ground state spin per added electron differs from non-interacting
quasiparticle expectations, and that the change in the
spin-polarization, due to Zeeman coupling, is strongly
influenced by Coulomb blockade physics.
Elenco dei partecipanti al convegno di Bari.