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6 ± 0.5 K and 93.8 ± 0.2 K, respectively. With Ni substitution the TC values were found to be enhanced to 104.5 ± 0.4 K for MgAl2O4(10 and 108.5 ± 0.6 K for MgO (10 substrates. X-ray photoelectron spectroscopy (XPS) suggests Cr3+oxidation states in the films, while Co ions are present in a mixed Co2+/Co3+oxidation state. The substitution of Ni at Co site significantly modifies the line shape of the core level as well as the valence band. Ni ions are also found to be in a mixed 2+/3+ oxidation state. O 1s core level display asymmetry
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