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Room-temperature positive magnetoresistance in (Fe0.64Cu0.06Co0.3)-graphite granular nanocomposites

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Abstract

(Fe0.64Cu0.06Co0.3)x-C100″x (x = 10, 20, 30, and 50%) nanocomposites were prepared from ball milled Fe-Cu-Co alloy nanoparticles and micron sized graphite powders. The Structural characterization has been carried out using X-ray diffraction and FESEM measurements, while the electrical transport measurements were carried out by conventional four probe technique. Magnetoresistance (MR) measurements were performed at room temperature up to 45 kOe magnetic field. Magnetic measurements on the composites show all the composites to be ferromagnetic. Although magnetic properties show significant changes in magnetization values, comparable variations could not be detected in MR measurements, suggesting the origin of large positive magnetoresistance is non-magnetic. The existing models for the electron transport behaviour fail to explain the H 3/2 dependence of the MR. The possible mechanism for the origin of positive MR in these composites has been discussed.

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Authors and Affiliations

  1. Department of Physics and Meteorology, Indian Institute of Technology, Kharagpur, 721302, India

    B. Bhoi & Vidyadhar Singh

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  1. B. Bhoi
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  2. Vidyadhar Singh
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Correspondence to B. Bhoi.

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Bhoi, B., Singh, V. Room-temperature positive magnetoresistance in (Fe0.64Cu0.06Co0.3)-graphite granular nanocomposites. Trans Indian Inst Met 64, 235 (2011). https://doi.org/10.1007/s12666-011-0047-z

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  • DOI: https://doi.org/10.1007/s12666-011-0047-z

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