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Large magnetoresistance in carbon-coated Ni/NiO nanoparticles

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Abstract

We report here a large magnetoresistance (MR) observed in carbon-coated Ni/NiO nanostructures synthesized by a chemical method. The crystalline nature and particle size of the graphitic-carbon-coated Ni/NiO nanostructure was investigated by X-ray diffraction study and field emission scanning electron microscope images. The Raman spectroscopy confirms the presence of graphite layer over the Ni/NiO nanostructure. The field-cooled (FC) magnetic hysteresis curves show exchange bias effect suggesting possible Ni/NiO core–shell structure. The temperature-dependent magnetization data show bifurcation in FC–zero-field-cooled curves, indicating the superparamagnetic behaviour and competing ferromagnetic (FM) and antiferromagnetic interactions in the nanocomposite. MR studies show a large negative MR of \(\sim \)20% at 18 K and \(\sim \)4.2% at room temperature, revealing significant enhancement of FM interactions at low temperatures and spin-dependent tunnelling of current through the nanocomposite.

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Acknowledgements

Authors thank Prof G U Kulkarni for the constant support and encouragement. SA thanks SERB for funding under EMR (EMR/2016/005081). SR and RK thank CeNS for JRF and post-doctoral fellowships, respectively.

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Authors and Affiliations

  1. Centre for Nano and Soft Matter Sciences (CeNS), Jalahalli, Bangalore, 560013, India

    Subir Roy, Rajesh Katoch & S Angappane

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  1. Subir Roy
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  2. Rajesh Katoch
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  3. S Angappane
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Correspondence to S Angappane.

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Roy, S., Katoch, R. & Angappane, S. Large magnetoresistance in carbon-coated Ni/NiO nanoparticles. Bull Mater Sci 41, 127 (2018). https://doi.org/10.1007/s12034-018-1645-8

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  • DOI: https://doi.org/10.1007/s12034-018-1645-8

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