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We have investigated the electronic and magnetic properties of Co-dopedPr0.8Ca0.2MnO3 thin films using various spectroscopic techniques. X-rayabsorption and hard x-ray photoemission spectroscopy revealed that thesubstituted Co ions are in the divalent state, resulting in hole doping on theMn atoms. Studies of element-selective magnetic properties by x-ray magneticcircular dichroism found a large orbital magnetic moment for the Co ions. Thesespectroscopic studies reveal that the substituted Co ions play several roles ofhole doping for Mn, ferromagnetic superexchange coupling between the Co2+ andMn4+ ions, and orbital magnetism of the Co2+ ions. Competition among thesecomplex interactions produces the unique electronic and magnetic behaviorsincluding enhanced coercivity of the Co-doped Pr0.8Ca0.2MnO3.

Spectroscopic studies on the electronic and magnetic states of Co-doped perovskite manganite Pr0.8Ca0.2Mn1-yCoyO3 thin films