The effect of thermal treatment on the magnetic properties of spinel ferrite nanoparticles in magnetic fluids

Magnetic properties of ferrites are dependent on the crystalline structure and location of metal ions in the material. The most commonly used materials of nanoparticles in magnetic fluids are chemical stable spinel (2-3) ferrites. The preparation of ferrite nanoparticles for magnetic fluids synthesis needs a special technology. More commonly used is the wet chemical coprecipitation production technology of magnetic nanoparticles for MF. The ferrites synthesized by the wet chemical method have different magnetic characteristics if compared to the ferrites prepared by standard ceramic methods. In this paper, the physical properties of ultrafine complex spinel-type Fe₂Co_0.3Zn_0.6Ca_0.1O₄, Fe_1.9Cd_0.1Mn_0.54Zn_0.46O₄, Fe₂CoO₄ and Fe₂Zn_0.6Mn_0.3Ca_0.1O₄ ferrite particles and MF on its base, after their special thermal treatment, are studied.