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Article Dans Une Revue Journal of the European Ceramic Society Année : 2017

Uniaxial anisotropy and enhanced magnetostriction of CoFe2O4 induced by reaction under uniaxial pressure with SPS

Alex Aubert
V. Loyau
M. Lobue

Résumé

In this study, we have compared magnetic and magnetostrictive properties of polycrystalline CoFe 2 O 4 pellets, produced by three different methods, focusing on the use of Spark Plasma Sintering (SPS). This technique allows a very short heat treatment stage while a uniaxial pressure is applied. SPS was utilized to sinter cobalt ferrite but also to make the reaction and the sintering (reactive sintering) of the same ceramic composition. Magnetic and magnetostrictive measurements show that the reactive sintering with SPS induces a uniaxial anisotropy, while it is not the case with a simple sintering process. The induced anisotropy is then expected to be a consequence of the reaction under uniaxial pressure. This anisotropy enhanced the magnetostrictive properties of the sample, where a maximum longitudinal magnetostriction of −229 ppm is obtained. This process can be a promising alternative to the magnetic-annealing because of the short processing time required (22 minutes).
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Dates et versions

hal-01636264 , version 1 (16-11-2017)

Identifiants

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Alex Aubert, V. Loyau, F. Mazaleyrat, M. Lobue. Uniaxial anisotropy and enhanced magnetostriction of CoFe2O4 induced by reaction under uniaxial pressure with SPS. Journal of the European Ceramic Society, 2017, 37 (9), pp.3101-3105. ⟨10.1016/j.jeurceramsoc.2017.03.036⟩. ⟨hal-01636264⟩
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