Abstract
Magnetic hysteresis curves of cobalt ferrites with a fraction of cobalt being replaced by magnesium (MgSUBx/SUBCoSUB1-x/SUBFe₂O₄) were investigated by vibrating sample magnetometry (VSM). The specimens with x ≤ 0.2 were prepared as thin films on silicon substrates by using a sol-gel deposition process. The VSM result revealed that the saturation magnetizations (MSUBS/SUB) of the Mg-substituted specimens were higher than that of CoFe₂O₄. The result of Raman spectral analysis suggested that the Mg-substituted specimens had higher tetrahedral CoSUP2+/SUP density in the spinel lattice compared to CoFe₂O₄. The increase in MS for MgSUBx/SUBCoSUB1-x/SUBFe₂O₄ is ascribed to two reasons, the increase in tetrahedral CoSUP2+/SUP density and significant MgSUP2+/SUP occupation in the tetrahedral sites.
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