Understanding of the low temperature anomalous magnetic and lattice properties in Co1.25Fe1.75O4 ferrite using dc magnetization and neutron diffraction experiments

•Dc magnetization and neutron diffraction on Co rich ferrite.•A correlation between structural and magnetic properties established.•Focus on temperature dependence of lattice parameter.•Focus on site exchange of cations and site magnetic moments.•Rule out of negative magnetization in Co ferrite. The...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2019-09, Vol.485, p.331-344
Main Authors: Bhowmik, R.N., Kumar, Amit, Yusuf, S.M.
Format: Article
Language:English
Subjects:
Anisotropy
Annealing
Anomalous lattice expansion
Co rich spinel ferrite
Cobalt
Coercivity
Depolarization
Diffraction patterns
Ferrites
Iron
Low temperature
Magnetic measurement
Magnetic moments
Magnetic properties
Magnetization
Mathematical analysis
Negative magnetization
Neutron depolarization
Neutron diffraction
Neutrons
Organic chemistry
Temperature
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Summary:•Dc magnetization and neutron diffraction on Co rich ferrite.•A correlation between structural and magnetic properties established.•Focus on temperature dependence of lattice parameter.•Focus on site exchange of cations and site magnetic moments.•Rule out of negative magnetization in Co ferrite. The present work has demonstrated the experimental results of dc magnetization and neutron diffraction measurements for Co1.25Fe1.75O4 ferrite. The material has been prepared by chemical route, and annealed at different temperatures to study its effect on the stabilization of Co and Fe ions in tetrahedral and octahedral sites. Magnetic measurements have been carried out to study the temperature variation of magnetization, coercivity and effective anisotropy constant of the samples. Neutron diffraction pattern has been used to calculate the lattice parameter, site distribution of Co and Fe ions, and site magnetic moments as the function of measurement temperature and annealing temperature of the samples. In this work, specific attempt has been made to understand the lattice and magnetic correlation by employing the neutron diffraction and neutron depolarization techniques. The experimental results suggest the possibility of an inverse relation between anomalous lattice expansion and decrement of high field magnetization at lower temperatures, typically below 150 K.
ISSN:0304-8853
1873-4766
DOI:10.1016/j.jmmm.2019.04.101