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Title of Journal: J Supercond Nov Magn

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Abbravation: Journal of Superconductivity and Novel Magnetism

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Springer US

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DOI

10.1016/j.aml.2007.05.013

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1557-1947

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The Influence of Annealing Temperature on the Magn

Authors: H M I Abdallah T Moyo
Publish Date: 2012/12/20
Volume: 26, Issue: 4, Pages: 1361-1367
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Abstract

Mn05Co05Fe2O4 nanosized ferrites have been made directly from MnFe2O4 and CoFe2O4 ferrites and from metal oxides by using highenergy ball milling Singlephase formation and microstructure of the asmilled samples and samples annealed at 100 200 300 400 and 500 ∘C under argon atmosphere were studied using powder Xray diffraction XRD and transmission electron microscopy TEM The average grain sizes were estimated from XRD measurements and found to be between 7 and 11 nm The microstrain for each sample was relieved by annealing due to crystallite growth Room temperature magnetic properties were investigated by zerofield 57Fe Mössbauer spectroscopy and vibrating sample magnetometer VSM Saturation magnetizations of the samples were estimated using the empirical law of approach to saturation The variation of coercive field saturation magnetization maximum magnetization and remanent magnetization for each sample was found to depend on the annealing temperature The coercive fields are observed to increase with increased annealing temperature from about 300 Oe for the asmilled samples to about 1000 Oe for samples annealed at 500 ∘C which we attribute to increases in grain sizes

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