Abstract
The effect of transformations induced by annealing on the structure and magnetic properties of α-Fe 2O 3 antiferromagnetic nanoparticles synthesized by chemical route has been investigated by transmission electron microscopy, magnetization measurements and Mössbauer spectroscopy. Annealing of these samples re-crystallize the nanoparticles without changing its mean size modifying the crystalline anisotropy energy of the nanoparticles leading to a change in the reversible–irreversible regime and in the Morin transition behaviour.
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