Abstract
The magnetic properties of aluminum-substituted cobalt ferrite, with the chemical formula CoAlxFe2−xO4, were investigated and synthesized using co-precipitation method. A coherent correlation between the saturation magnetization and aluminum concentration was observed. An increase in aluminum content lead to a decrease of coercivity (HC) retentivity (MR) and saturation magnetization (MS). According to the growth in the sub spectral areas obtained by Mössbauer spectroscopy, it was estimated that the agreeable ferric ions belong essentially to the site B, where the Mössbauer portion of site A does not vary appreciably. The dependence of Mössbauer parameters on hyperfine magnetic field, isomer shift and quadruple splitting on aluminum ions content were discussed.
•Nanocrystalline CoAlxFe2−xO4 ferrites were synthesized using co-precipitation technique.•Coherent correlation between the saturation magnetization and aluminum concentration was observed.•Aluminum addition tends to reduce both the coercivity and the saturation magnetization•The achieved squareness ratio (Mr/MS) around 0.40 at room temperature is highly beneficial for the memory devices applications.•The stability of magnetization with temperature increases with the increase of Al3+ concentration. The cation distribution is concluded from the tendency site energies, magnetic properties and Mössbauer data at room temperature.