Synthesis and Magnetic Properties of LaMnO₃/α-Al₂O₃ Magnetic Nanocomposites

Abstract

In this paper, LaMnO3/α-Al2O3magnetic nanocomposites were synthesized through using a soft-chemistry route. The synthesis strategy in this work is based on a soft-chemistry process using a polyacrylamide gel route in which citric acid is employed as the chelating agent. The composites were characterized by thermogravimetric and differential scanning calorimetry analyses, X-ray diffraction, scanning electron microscope, energy dispersive x-ray spectroscopy and vibrating sample magnetometer. Scanning electron microscope observation reveals that the content of α-alumina decreases with the increase of number of sample surface particle in the composites. Magnetic hysteresis loop measurement shows that the LaMnO3sample exhibit paramagnetism at room temperature. Interestingly, the weak ferromagnetism at room temperature was observed for a composition of 0.7 α-Al2O3/ 0.3 LaMnO3. The forming mechanisms and magnetic properties of α-Al2O3/ LaMnO3composites have been discussed based on the experimental results.