Abstract
The agglomeration kinetics of magnetic nanoparticles under the magnetic field is studied by measuring the temporal change of the magnetic weight. The kinetics of stretched exponential is observed for the growth of the magnetic weight, which results from the distribution of the energy barrier. The agglomeration kinetics is simulated with the Boltzmann distribution function of the energy barrier. The Boltzmann distribution seems plausible for the agglomeration of nanoparticles where the diffusion of low energy barrier is dominant. The comparison with the experimental results indicates that the Boltzmann distribution is inappropriate for energy barrier distribution function even though the dynamics close to the stretched exponential is reproduced. The kinetic parameters deduced from the simulation results suggest that the complex structural relaxation of the agglomerate with higher energy barrier is more dominant than the diffusion in the growth of the magnetic weight.
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