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Influence of vacuum sintering on microstructure and magnetic properties of magnetostrictive cobalt ferrite

Nlebedim, Cajetan Ikenna, Ranvah, Naresh, Williams, Paul Ieuan, Melikhov, Yevgen, Anayi, Fatih Jamel, Snyder, John Evan, Moses, Anthony John and Jiles, David 2009. Influence of vacuum sintering on microstructure and magnetic properties of magnetostrictive cobalt ferrite. Journal of Magnetism and Magnetic Materials 321 (17) , pp. 2528-2532. 10.1016/j.jmmm.2009.03.021

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Abstract

Differences in the microstructure and magnetic properties of highly magnetostrictive cobalt ferrite resulting from the effects of different vacuum sintering temperatures and times have been investigated. A vacuum environment was chosen to allow direct comparison of results with air-sintered samples which are more often reported in the literature. It was found that vacuum sintering resulted in the development of a solid solution second phase with composition Co1−xFexO4 (x∼0.33). There was a decrease in magnetostriction as a result of the formation of the second phase. Furthermore, differences in sintering temperatures were found to have a greater effect on the magnetostriction than differences in sintering times. It was found that the first order cubic anisotropy coefficient initially increased with both sintering temperature and time, before peaking and decreasing to its lowest measured value. The lowest anisotropy was therefore achieved with samples sintered at higher temperatures and longer times.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Uncontrolled Keywords: Anisotropy coefficient; Cobalt ferrite; Magnetoelastic property; Magnetostriction; Vacuum sintering
Publisher: Elsevier
ISSN: 0304-8853
Last Modified: 02 Jun 2019 23:08
URI: http://orca-mwe.cf.ac.uk/id/eprint/7990

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