Abstract
To identify the substitution of Cu element for cations in transition metal oxide AB2O4 structure, we propose to investigate the structural, optical and magnetic properties of Cu-doped Mn1.56Co(0.96-x)Ni0.48CuxO4+δ films with 0 ≤ x ≤ 0.2. The X-ray diffraction of Mn1.56Co(0.96-x)Ni0.48CuxO4+δ films indicates good crystallization and cubic spinel structure. Raman spectra show two peaks of F2g and A1g vibration modes, and the peak position changes with Cu dopant. The transition temperatures TP1, TP2 shift towards lower temperature by Cu doping, and the saturation magnetization MS decreases monotonously. The results show that the substitution of Cu ions does not vary the crystal structure but changes the ratio of Mn3+/Mn4+. Our proposed way overcomes the difficulties to directly observe the atoms of Mn, Co, Ni, and Cu with closed sizes in microstructure, and it is instructive to further understand the conduction mechanism of doped manganese cobalt nickel oxides in theory.
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