Electron-magnon coupling and nonlinear tunneling transport in magnetic nanoparticles

Details Electron-magnon coupling and nonlinear tunneling transport in magnetic nanoparticles Electron-magnon coupling and nonlinear tunneling transport in magnetic nanoparticles

2005-12-29

arxiv.org/abs/cond-mat/0512697v2

Phys. Rev. Lett. 97, 096804 (2006)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 2 figures

Scientific paper

10.1103/PhysRevLett.97.096804

We present a theory of single-electron tunneling transport through a ferromagnetic nanoparticle in which particle-hole excitations are coupled to spin collective modes. The model employed to describe the interaction between quasiparticles and collective excitations captures the salient features of a recent microscopic study. Our analysis of nonlinear quantum transport in the regime of weak coupling to the external electrodes is based on a rate-equation formalism for the nonequilibrium occupation probability of the nanoparticle many-body states. For strong electron-boson coupling, we find that the tunneling conductance as a function of bias voltage is characterized by a large and dense set of resonances. Their magnetic field dependence in the large-field regime is linear, with slopes of the same sign. Both features are in agreement with recent tunneling experiments.

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