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

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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/τ₀) 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.