Effect of a dc bias magnetic field on the magnetization relaxation of antiferromagnetic nanoparticles

Bachir Ouari and Yuri P. Kalmykov
Phys. Rev. B 83, 064406 – Published 10 February 2011

Abstract

The relaxation of the magnetization of antiferromagnetic nanoparticles owing to thermal agitation is treated via the Fokker-Planck equation describing the evolution of the distribution function of the magnetization orientations of an individual nanoparticle. By solving this equation using matrix-continued fractions, the correlation function of the longitudinal component of the magnetization, its characteristic relaxation times, and dynamic susceptibility are calculated for arbitrary dc field orientations across wide ranges of frequencies, temperatures, and damping. Furthermore, a simple analytic equation for the dynamic susceptibility at low frequencies is also proposed. It is shown that a dc field applied at an angle to the easy axis of the particle alters essentially the magnetization dynamics of the particle owing to coupling of the magnetization reversal mode with the precessional modes.

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  • Received 1 October 2010

DOI:https://doi.org/10.1103/PhysRevB.83.064406

©2011 American Physical Society

Authors & Affiliations

Bachir Ouari and Yuri P. Kalmykov

  • LAMPS, Université de Perpignan, 52, Avenue Paul Alduy, 66860 Perpignan Cedex, France

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Issue

Vol. 83, Iss. 6 — 1 February 2011

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