  We have presented the synthesis, structural, and magnetic properties from the
experimental point of view. Then we verified our experimental observation by
studying the electronic and magnetic properties of Al-doped LaMnO3 from the
first principle density functional theory (DFT) and Monte-Carlo simulation. We
have synthesized the LaAlxMn1-xO3 (x= 0.05, 0.15, 0.25) and performed the
Rietveld refinement of XRD data to determine the lattice parameters. To see the
mixed valance of Mn-ion, we performed the XPS of 25% Al-doped material. The
magnetic study shows the ferromagnetic transition of these materials. Using XRD
refinement values, we have completed the DFT calculations. The Monte Carlo
simulation has been done through the anisotropic Ising model to analyze the
origin of magnetic transition. We have determined the anisotropy and the
interaction constants from the DFT calculations.
