Magnetic Properties of Nanocrystalline CoFe2O4 Particles

Abstract

The temperature and field dependence of magnetization has been investigated in the temperature range from 2K to 300K in two samples consisting of nanocrystalline CoFe2O4 and polymer in either water (as ferrofluid) or in potassium silicate (as glass). It is found that the magnetic hysteresis phenomena depends strongly on the different cooled process (the zero-field cooled and field cooled process). The relaxation of magnetization measurements were performed for different applied field at 2.4K, to get a deeper understand the mechanism associated to hysteresis phenomena. The Mossbauer spectroscopy was carried out at different temperatures to study the blocking and the interactions between the particles. The matrix effect on the magnetic properties was also studied.