Structural and magnetic properties of CoMn2O4 synthesized by auto combustion method
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Combustion synthesized cobalt manganite (CMO) was systematically studied for its structural and magnetic properties. X-ray diffraction (XRD) pattern with high-intensity peaks at appropriate positions revealed the formation of phase pure and highly crystalline CMO. The distorted tetragonal structure of the CMO unit cell suggested the presence of high spin (d4) Jahn–Teller Mn3+ ions. X-ray photoelectron spectra (XPS) supported a mixed spinel with Co2+, Co3+, Mn2+ and Mn3+ cations. Electron microscopy confirmed the formation of submicron-sized CMO particles with well-defined lattice fringes, while low-temperature magnetic investigations revealed that the prepared CMO as a ferrimagnetic spinel due to the presence of uncompensated electronic states. The observed unsaturated magnetization, even at large applied fields, confirmed the high degree of spin-canting due to the existence of Yafet–Kittel spin arrangement.
This work was supported by the National Research Foundation of Korea Grant funded by the Korean Government (MEST) (NRF-2011-C1AAA0010030538).
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