Abstract
The effect of dipolar interaction on the law of magnetic relaxation in the two-dimensional (2D) ensembles of uniaxial spherical nanoparticles distributed on the sites of a square lattice has been studied within the mean-field approximation. The equation that describes the time evolution of magnetization has been derived, and in the limiting cases of small and large times it has been solved. It has been shown that the magnetic relaxation in these ensembles is characterized by two different relaxation times, viz., the initial (smaller) relaxation time and the final (larger) one. The difference between these relaxation times determines the deceleration of magnetic relaxation.
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