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We report the results of a study undertaken to determine properties of magnetite particles that dissipate heat only through Néel relaxation. The magnetite samples we considered for the heat dissipation studies were found to dissipate heat through both Néel and Brownian relaxations. The relative contributions of both relaxations on magnetic heat dissipation were investigated by analyzing the physical, magnetic, and heating characteristics of magnetite particles with various average diameters dispersed in low and high viscosity media. The results suggested that the size of magnetite particles that dissipated heat through Néel relaxation was around 12 nm and this agreed well with theoretical predictions.

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