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Electron Spin Resonance Study of Co-doped ZnO System: Spin-Canted Magnetism and Sintering Effects

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Abstract

We report on the electron spin resonance (ESR) studies in the Mn:Ni and Mn:Gd co-doped ZnO system sintered at 500 and 800 °C. We found that sintering temperature has strong effect on the ESR line widths, with the Mn-Gd co-doped ZnO system showing the largest effect. Increasing sintering temperature has increased the line widths considerably, running into Kilo Oersted range. These large line widths indicate magnetic in-homogeneities and disorder and are consistent with the occurrence of secondary phases due to high-temperature sintering. Further analysing the asymmetry parameters, together with Δg/ g-values, we explain the weak ferromagnetism at low temperatures in 500°C sintered Mn:Gd-ZnO system to be due to spin canting which is the parasitic or the ‘spin-canted magnetism’. The ESR line intensity which is the spin susceptibility shows a paramagnetic behaviour in the range 300–100 K and shows a sharp rise and a peak around 40 K consistent with the magnetization data reported earlier. In the case of Mn:Ni–ZnO system, the Δg/ g and P asc parameters, which are proportional to spin canting and magneto-crystalline anisotropy, closely follow each other representing the classic picture of Moriya-Dzyaloshinsky.

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Acknowledgments

Author J Das acknowledges UNISA for providing the post-doctoral fellowship and Silicon Institute of Technology, India, for the sabbatical leave. V V Srinivasu acknowledges partial support from UNISA, SPCC project and NRF grant competitive program for rated researcher NRF grant.

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Authors and Affiliations

  1. Department of Physics, University of South Africa, Johannesburg, 1710, South Africa

    T S Mahule, V. V. Srinivasu & J. Das

  2. Department of Physics, Silicon Institute of Technology, Bhubaneswar, 751024, Odisha, India

    J. Das

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  1. T S Mahule
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  2. V. V. Srinivasu
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  3. J. Das
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Correspondence to T S Mahule.

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Mahule, T.S., Srinivasu, V.V. & Das, J. Electron Spin Resonance Study of Co-doped ZnO System: Spin-Canted Magnetism and Sintering Effects. J Supercond Nov Magn 30, 1377–1380 (2017). https://doi.org/10.1007/s10948-016-3676-y

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  • DOI: https://doi.org/10.1007/s10948-016-3676-y

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