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

In this study, we have compared magnetic and magnetostrictive properties of polycrystalline CoFe2O4 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...

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Bibliographic Details
Published in:Journal of the European Ceramic Society 2017-08, Vol.37 (9), p.3101-3105
Main Authors: Aubert, A., Loyau, V., Mazaleyrat, F., LoBue, M.
Format: Article
Language:English
Subjects:
Cobalt ferrite
Condensed Matter
Engineering Sciences
Magnetic anisotropy
Magnetostriction
Materials
Materials Science
Physics
Reactive sintering
Spark plasma sintering
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Summary:In this study, we have compared magnetic and magnetostrictive properties of polycrystalline CoFe2O4 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 −229ppm is obtained. This process can be a promising alternative to the magnetic-annealing because of the short processing time required (22min).
ISSN:0955-2219
1873-619X
DOI:10.1016/j.jeurceramsoc.2017.03.036