Effects of the Magnetic Field on the Relaxation of Small Particle Systems

Details Effects of the Magnetic Field on the Relaxation of Small Particle Systems Effects of the Magnetic Field on the Relaxation of Small Particle Systems

2002-05-30

arxiv.org/abs/cond-mat/0205652v1

Computational Materials Science 25, 577 (2002)

Physics

Condensed Matter

Materials Science

16 pages,6 figures imbedded. To be published in J. Comp. Material Science

Scientific paper

10.1016/S0927-0256(02)00337-3

We study the effect of a magnetic field on the thermal relaxation of non-interacting small monodomain particle systems particles with a distribution of anisotropy constants and random easy-axes directions. Numerical calculations of the relaxation curves for different distribution widths, and under different magnetic fields $H$ and temperatures $T$, have been performed in the framework of a two-state approximation. We show how the obtained data can be analyzed in terms of an modified $Tln(t/\tau_0)$ scaling from which the field dependence of the mean relaxing energy barriers can be extracted, a microscopic information which is not easily obtainable by other methods.

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