Dynamical and thermal effects in nanoparticle systems driven by a rotating magnetic field

S. I. Denisov, T. V. Lyutyy, P. Hänggi, and K. N. Trohidou
Phys. Rev. B 74, 104406 – Published 6 September 2006

Abstract

We study dynamical and thermal effects that are induced in nanoparticle systems by a rotating magnetic field. Using the deterministic Landau-Lifshitz equation and appropriate rotating coordinate systems, we derive the equations that characterize the steady-state precession of the nanoparticle magnetic moments and study a stability criterion for this type of motion. On this basis, we describe (i) the influence of the rotating field on the stability of the small-angle precession, (ii) the dynamical magnetization of nanoparticle systems, and (iii) the switching of the magnetic moments under the action of the rotating field. Using the backward Fokker-Planck equation, which corresponds to the stochastic Landau-Lifshitz equation, we develop a method for calculating the mean residence times that the driven magnetic moments dwell in the up and down states. Within this framework, the features of the induced magnetization and magnetic relaxation are elucidated.

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  • Received 9 June 2006

DOI:https://doi.org/10.1103/PhysRevB.74.104406

©2006 American Physical Society

Authors & Affiliations

S. I. Denisov1,2, T. V. Lyutyy2, P. Hänggi1, and K. N. Trohidou3

  • 1Institut für Physik, Universität Augsburg, Universitätsstraße 1, D-86135 Augsburg, Germany
  • 2Sumy State University, 2 Rimsky-Korsakov Street, 40007 Sumy, Ukraine
  • 3Institute of Materials Science, NCSR “Demokritos,” 15310 Athens, Greece

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Issue

Vol. 74, Iss. 10 — 1 September 2006

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