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Effect of heat treatment on the magnetic and magnetoelastic properties of cobalt ferrite

Nlebedim, Cajetan Ikenna, Ranvah, Naresh, Williams, Paul Ieuan, Melikhov, Yevgen, Snyder, John Evan, Moses, Anthony John and Jiles, David 2010. Effect of heat treatment on the magnetic and magnetoelastic properties of cobalt ferrite. Journal of Magnetism and Magnetic Materials 322 (14) , pp. 1929-1933. 10.1016/j.jmmm.2010.01.009

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The influence of different heat treatments on the magnetic and magnetoelastic properties of highly magnetostrictive CoFe(2)O(4) has been investigated. The first order cubic anisotropy coefficient, coercive field, magnetostriction and high strain sensitivity were observed to decrease as the heat treatment temperature increased. The saturation magnetization of the samples on the other hand increased with increase in heat treatment temperature. These changes were not accompanied by any observable changes in crystal structure or composition and are indicative of migration of Co(2+) from the octahedral sites (B-sites) to the tetrahedral sites (A-sites) and Fe(3+) from the A-sites to the B-sites of the spinel structure. Different distributions of the cations at the two distinct lattice sites can strongly affect the magnetic and magnetoelastic properties of these materials.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Subjects: Q Science > QC Physics
Uncontrolled Keywords: Anisotropy coefficient; Cobalt ferrite; Magnetostriction; Annealing temperature; Quenching; Strain sensitivity
Publisher: Elsevier
ISSN: 0304-8853
Funders: UK Engineering and Physical Science Research Council, US National Science Foundation
Last Modified: 09 Jul 2020 15:16

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