Stochastic dynamics of magnetization in a ferromagnetic nanoparticle out of equilibrium
Mesoscale and Nanoscale Physics
2009-03-30 v1
Abstract
We consider a small metallic particle (quantum dot) where ferromagnetism arises as a consequence of Stoner instability. When the particle is connected to electrodes, exchange of electrons between the particle and the electrodes leads to a temperature- and bias-driven Brownian motion of the direction of the particle magnetization. Under certain conditions this Brownian motion is described by the stochastic Landau-Lifshitz-Gilbert equation. As an example of its application, we calculate the frequency-dependent magnetic susceptibility of the particle in a constant external magnetic field, which is relevant for ferromagnetic resonance measurements.
Keywords
Cite
@article{arxiv.0809.2611,
title = {Stochastic dynamics of magnetization in a ferromagnetic nanoparticle out of equilibrium},
author = {D. M. Basko and M. G. Vavilov},
journal= {arXiv preprint arXiv:0809.2611},
year = {2009}
}
Comments
15 pages, 6 figures