Abstract
A new model for the FC and ZFC magnetization processes for fine particle systems is described that uses the two-level model for the thermal relaxation. An approximate method for the resolution of the master equation for a temperature or field varying process is developed. The volume and easy axis distributions as well as the temperature dependencies of the intrinsic magnetization and anisotropy are taken into account. In the low applied field limit and for randomly oriented systems, an Onsager-type attempt shows that dipole interactions can account for the dependence of the FC and ZFC magnetization curves on the concentration and sample shape. Numerical results are in good agreement with experimental data obtained for various concentration /spl gamma/-Fe/sub 2/O/sub 3/ nanoparticle systems.
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