Magnetoresistive properties of Zn1-xCoxFe2O4 ferrites

The magnetic and magnetoresistive properties of spinel-type Zn1-xCoxFe2O4 (x=,0.2 and 0.4) ferrites are extensively investigated in this study. A large negative magnetoresistance (MR) effect is observed in Zn1-xCoxFe2O4 ferrites of spinel structure. These materials are either ferrimagnetic or parama...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2008-03, Vol.320 (6), p.1157-1162
Main Authors: Hossain, A K M Akther, Tabata, H, Kawai, T
Format: Article
Language:English
Online Access:Get full text
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Summary:The magnetic and magnetoresistive properties of spinel-type Zn1-xCoxFe2O4 (x=,0.2 and 0.4) ferrites are extensively investigated in this study. A large negative magnetoresistance (MR) effect is observed in Zn1-xCoxFe2O4 ferrites of spinel structure. These materials are either ferrimagnetic or paramagnetic at room temperature, and show a spin-(cluster) glass transition at low temperatures, depending on the chemical compositions. The MR curves as a function of magnetic fields, MR(H), are parabolic at all temperatures for paramagnetic polycrystalline ZnFe2O4. The MR for ZnFe2O4 at 110K in the presence of 9T applied magnetic field is 30%. On the other hand, MR(H) are linear for x=0.2 and 0.4 ferrimagnetic Zn1-xCoxFe2O4 samples up to 9T. The MR effect is independent of the sintering temperatures, and can be explained with the help of the spin-dependent scattering and the Yafet-Kittel angle of Zn1-xCoxFe2O4 mixed ferrites.
ISSN:0304-8853
DOI:10.1016/j.jmmm.2007.11.009