Abstract
In this study, lanthanum Ferrite (LaFeO3) thin films were prepared by sol-gel method for magnet technology. With this context, precursor solutions with low contact angles were synthesized from all nitrate salts of the respective cations (La, Fe), using methanol as solvent and citric acid as chelating agents. The obtained gel films were dried at heat-treated at 500 oC for 10 minutes in air. The oxide thin films were annealed at 850 oC for 60 and 120 minutes and 1000 oC for 120 minutes in air. DTA/TG results revealed that endothermic and exothermic reactions are observed at temperature between 29 oC and 450 oC due to solvent removal, combustion of carbon based materials and oxidation of La and Fe. The spectrum of La-Fe precursor film annealed at 850oC and 1000 oC shows an absence of absorption bands corresponding to organics and hydroxyls. LaFeO3 phase was found as well as pure perovskite with low intensity from XRD patterns. It was found that surface morphologies of the film with homogeneous structures. The thermal, phase, microstructural and magnetic properties of the obtained samples were determined by TG/DTA, FTIR, XRD, SEM, XPS, wetting angles and VSM. The results show that sustained perovskite polycrystalline films were grown on the (100)-oriented Si substrates. In addition, the films show strong ferromagnetic behavior.
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