Abstract
The magnetic and magnetoresistive properties of spinel-type Zn 1− x Co x Fe 2O 4 ( x=0, 0.2 and 0.4) ferrites are extensively investigated in this study. A large negative magnetoresistance (MR) effect is observed in Zn 1− x Co x Fe 2O 4 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 ZnFe 2O 4. The MR for ZnFe 2O 4 at 110 K in the presence of 9 T applied magnetic field is 30%. On the other hand, MR( H) are linear for x=0.2 and 0.4 ferrimagnetic Zn 1− x Co x Fe 2O 4 samples up to 9 T. 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 Zn 1− x Co x Fe 2O 4 mixed ferrites.
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