  The predictions of a newly developed Bloch-Bloembergen alike analytic
magnetization model are compared to experimental results. The effect of size
polydipersity on the specific absorption loss is demonstrated for the magnetic
nanoparticles containing media. Specific absorption rate shows resonance like
behivior as a function of particle size. The obtained results are in excellent
agreement with experimental data. The dominace of the Neel relaxation over the
Brownian one is demonstrated.
