In this work, we investigate the effect of annealing process at different temperatures (600 and 800 C) on
structural, magnetic and magnetocaloric properties of La0.7Ba0.3MnO3/xTiO2 system with x ¼ 0.04 and
0.06. Crystal structure analysis shows the R-3c rhombohedral symmetry for composites in both
annealing temperatures indicating structure stability. Magnetization and coercive field of doped composites
increase with increasing annealing temperature, while there is no effect on their Curie temperature
(Tc) that remains constant at 348 K due to the TiO2-La0.7Ba0.3MnO3 interaction lack. Increasing
annealing temperature is found to be an effective process that can positively affect the magnetocaloric
properties. Where, the relative cooling power of doped composites increases from 50 to 62 J/kg for
x ¼ 0.04 composite and from 54 to 66 J/kg for x ¼ 0.06 composite with increasing annealing temperature
from 600 to 800 C. Moreover, the experimental results of magnetic entropy change have been modulated
using Landau theory and the calculations have indicated the negligible contribution of elastic,
magnetoelastic and magnetoelectronic coupling in the magnetocaloric properties of La0.7Ba0.3MnO3/
xTiO2 system in both annealing temperatures.