Magnetoresistive properties of Zn1−xCoxFe2O4 ferrites |
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| Authors: | A.K.M. Akther Hossain H. Tabata T. Kawai |
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| Affiliation: | 1. Department of Physics, Bangladesh University of Engineering and Technology, Dhaka 1000, Bangladesh;2. Department of Bioengineering and Electronic Engineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan;3. Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan |
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| Abstract: | The magnetic and magnetoresistive properties of spinel-type Zn1−xCoxFe2O4 (x=0, 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 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 Zn1−xCoxFe2O4 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 Zn1−xCoxFe2O4 mixed ferrites. |
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| Keywords: | 75.70.P 75.50.Gg |
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