Electron-magnon coupling and nonlinear tunneling transport in magnetic nanoparticles

Abstract

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.

4 pages, 2 figures

References in corpus (5)

• Phonon effects in molecular transistors: Quantum and classical treatment
• Vibrational sidebands and dissipative tunneling in molecular transistors
• Elementary Excitations of Ferromagnetic Metal Nanoparticles
• Anisotropy in Ferromagnetic Nanoparticles: Level-to-Level Fluctuations of a Collective Effect
• Mesoscopic bound on anisotropy in itinerant ferromagnets

Cited by in corpus (4)

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• Voltage-Controlled Surface Magnetization of Itinerant Ferromagnet Ni_(1-x)Cu_x
• Detecting and Switching Magnetization of Stoner Nanograin in Non-local Spin Valve
• Microwave coupled electron tunneling measurement of Co nanoparticles