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No.1(pp.1-59)

Home > Issues > Volume 11 (2006) > No.1(pp.1-59)

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

Kwang-Joo Kim*

(Department of Physics, Konkuk University), Hee-Kyung Kim(Department of Physics, Konkuk University), Young-Ran Park(Department of Physics, Konkuk University), Jae-Yun Park(Department of Materials Science and Engineering, University of Incheon)

Abstract

Variation of magnetic properties through Cr substitution for Co in inverse-spinel CoFe₂O₄has been investigated by vibrating-sample magnetometry (VSM) and conversion electron Mössbauer spectroscopy (CEMS). Cr_sCo_1-sFe₂O₄samples were prepared as thin films by a sol-gel method. The lattice constant of the Cr_sCo_1-sFe₂O₄samples 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 Cr_sCo_1-sFe₂O₄was confirmed by CEMS analysis. Room-temperature magnetic hysteresis curves for the Cr_sCo_1-sFe₂O₄films measured by VSM revealed that the saturation magnetization M_sincreases by Cr doping. The M_sis maximized when x = 0.1 and decreases for higher x but is still bigger than that of CoFe₂O₄. The increase of M_scan be explained partly by the reduction of the tetrahedral Fe³⁺ion to Fe²⁺ .

Keywords: spinel; cobalt ferrite; substitution; magnetization; Mössbauer

DOI:

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