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Effects of Cr Doping on Magnetic Properties of Inverse Spinel CoFe2O4Thin Films
Journal of Magnetics, Volume 11, Number 1, 31 Mar 2006, Pages 51-54
Abstract
Variation of magnetic properties through Cr substitution for Co in inverse-spinel CoFe2O4 has been investigated by vibrating-sample magnetometry (VSM) and conversion electron Mössbauer spectroscopy (CEMS). CrsCo1-sFe2O4 samples were prepared as thin films by a sol-gel method. The lattice constant of the CrsCo1-sFe2O4 samples was found to remain unchanged, explainable in terms of a reduction of tetrahedral Fe3+ ion to Fe2+ due to substitution of Cr3+ ion into octahedral Co2+ site. The existence of the tetrahedral Fe2+ions in CrsCo1-sFe2O4 was confirmed by CEMS analysis. Room-temperature magnetic hysteresis curves for the CrsCo1-sFe2O4 films measured by VSM revealed that the saturation magnetization Msincreases by Cr doping. The Ms is maximized when x = 0.1 and decreases for higher x but is still bigger than that of CoFe2O4 . The increase of Ms can be explained partly by the reduction of the tetrahedral Fe3+ion to Fe2+ .
Keywords: spinel; cobalt ferrite; substitution; magnetization; Mössbauer
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