Abstract
In the quest for suitable materials for hyperthermia we explored the preparation andproperties of nanoparticles of Co ferrite. The material was produced by coprecipitationfrom water solution of Co and Fe chlorides and afterwards annealed at 400, 600 and800 °C. The resulting particles were characterized by XRD, TEM, Mössbauer spectroscopy, and dcand ac magnetometry. The heating experiments in ac magnetic fields of variousamplitudes were performed with diluted systems of particles suspended in agarose geland the results were interpreted on the basis of the ac magnetic losses measuredat various temperatures. The increase of magnetic losses and consequently ofthe heating efficiency with increasing temperature is explained by the strongdependence of the constant of magnetocrystalline anisotropy of Co ferrite ontemperature.
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