Abstract
We present results corresponding to the simulation of the relaxation of simple magnetic systems consisting of isolated and coupled grains. Those results, obtained in the framework of the micromagnetic approximation, evidence remarkable differences with the classical two-level system predictions in which the experimental treatment of the magnetic viscosity phenomenology is based. In particular, we show the existence of a waiting time required to nucleate the well-defined magnetic moment structures which are responsible for the change of the global state of the system. In addition to this, we observe the occurrence of nonequivalent relaxation trajectories.
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