Intrinsic magnetic resonance in superparamagnetic systems

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Abstract
A unified description for different mechanisms of the intrinsic FMR absorption-line broadening in superparamagnets is developed and used for the analysis of their temperature behavior. Whereas the homogeneous contribution provokes a monotonic increase of the linewidth, the nonhomogeneous one saturates with the temperature growth. The crossover of these effects may account for the experimentally observed temperature-independent linewidths in ferromagnetic fine-particle systems.