We investigate the ground state properties of Invar alloys via detailed study electronic structure Fe1−xNix (x = 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.9) employing x-ray photoelectron spectroscopy (XPS). While all exhibit soft ferromagnetic behavior with Curie temperature much higher than room temperature, results for invar alloy, Fe0.6Ni0.4 anomalous behavior. Moreover, magneto-resistance alloy beco...