Effects of Mn substitution of Co and Fe in spinel CoFe2O4 thin films |
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Authors: | Kwang Joo Kim Hee Kyung Kim Young Ran Park Jae Yun Park |
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Institution: | 1. Department of Physics, Konkuk University, Seoul 143-701, Republic of Korea;2. Department of Materials Science and Engineering, University of Incheon, Incheon 402-749, Republic of Korea |
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Abstract: | Effects of Mn substitution for Co and Fe on the structural and magnetic properties of inverse-spinel CoFe2O4 have been investigated. MnxCo1−xFe2O4 and MnyCoFe2−yO4 thin films were prepared by a sol–gel method. The observed increase of the lattice constant of MnxCo1−xFe2O4 indicates that Mn2+ ions substitute the octahedral Co2+ sites. Conversion electron Mössbauer spectroscopy data indicate that a fraction of octahedral Co2+ ions exchange sites with tetrahedral Fe3+ ions through Mn doping. Vibrating-sample magnetometry data exhibit a large increase of saturation magnetization for both MnxCo1−xFe2O4 and MnyCoFe2−yO4 films compared to that of the CoFe2O4 film. Such enhancement of magnetization can be explained in terms of a breaking of ferrimagnetic order induced by the Co2+ migration. |
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Keywords: | 75 50 Ss 75 70 Ak 76 30 Fc 75 60 Ej |
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