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Home > Issues > RetrieveCo2+ Distribution and the Related Magnetic Evolution in Ca-substituted Spinel CoFe2O4
Journal of Magnetics, Volume 26, Number 4, 31 Dec 2021, Pages 410-414
Kwang Joo Kim (Konkuk University), Jongho Park (Konkuk University), Jae Yun Park * 
(Incheon National University)
(Incheon National University)
Abstract
Magnetic properties of cobalt ferrites with a portion of Co2+ ions being replaced by Ca2+ were investigated by
vibrating-sample magnetometry (VSM). The CaxCo1-xFe2O4 (x ≤ 0.2) specimens were prepared as thin films by
a sol-gel deposition method. According to the VSM results, the saturation magnetization (MS) of the Ca-substituted
ferrite decreased from that of CoFe2O4 proportional to the Ca composition x. Raman spectral analyses
revealed that the Ca-substituted ferrites had a lower tetrahedral Co2+ population in the spinel lattice compared
to CoFe2O4. The decreasing trend of MS is consistent with the result of theoretical evaluation in which the relative
population of Co2+ ions among the tetrahedral and octahedral sites is proportional to the relative Raman
scattering intensities of 615 and 470 cm-1 peaks, respectively.
vibrating-sample magnetometry (VSM). The CaxCo1-xFe2O4 (x ≤ 0.2) specimens were prepared as thin films by
a sol-gel deposition method. According to the VSM results, the saturation magnetization (MS) of the Ca-substituted
ferrite decreased from that of CoFe2O4 proportional to the Ca composition x. Raman spectral analyses
revealed that the Ca-substituted ferrites had a lower tetrahedral Co2+ population in the spinel lattice compared
to CoFe2O4. The decreasing trend of MS is consistent with the result of theoretical evaluation in which the relative
population of Co2+ ions among the tetrahedral and octahedral sites is proportional to the relative Raman
scattering intensities of 615 and 470 cm-1 peaks, respectively.
Keywords: ferrite; calcium; thin film; Raman scattering; magnetic properties
DOI: https://doi.org/10.4283/JMAG.2021.26.4.410
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