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Coercivity and interactions in coprecipitated and ceramic SrFe12O19 (Sr‐M) hexaferrite samples were studied using remanence curves and magnetic viscosity in addition to microstructural considerations by means of SEM analysis. Following a magnetic viscosity formalism, the activation volume was obtained and interactions were evaluated using the ΔM technique. Even for a coprecipitated sample with a high coercive field (Hc = 6100 Oe), the experimental activation volume indicates a non‐coherent mechanism for magnetization reversal and demagnetizing‐like interactions were found in this isotropic sample with large aspect ratio particles; also demagnetizing‐like interactions were found for a thermally treated coprecipitated sample and a ceramic sample.

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