Annealing effects on structural and magnetic properties of a-Fe2O3 nanoparticles

VASQUEZ MANSILLA, MARCELO; ZYSLER, ROBERTO D.; ARCIPRETE, CARLOS; DIMITRIJEWITS, MARTA I.; RODRIGUEZ-SIERRA, D.; SARAGOVI, CELIA

Recife, Brasil

Conferencia; International Conference on Magnetism; 2000

The effect of transformations induced by annealing on the structure and magnetic properties of α-Fe2O3 antiferromagnetic nanoparticles synthesized by chemical route has been investigated by transmission electron microscopy, magnetization measurements and Mössbauer spectroscopy. Annealing of these samples recrystallize 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.