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Ferromagnetism of Graphite Nanopowders with Cobalt Oxide Impurity and Its Evolution at Moderate Annealing

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Inorganic Materials: Applied Research Aims and scope

Abstract

A study of the influence of a small impurity of cobalt oxide CoO on the magnetic properties of graphite nanopowder is presented in this article. It is shown that such an impurity is responsible for the weak ferromagnetism of a sample freshly prepared and annealed at 670 K in air, which substantially increases after vacuum annealing. The effect of an exchange bias caused by the partial reduction of antiferromagnetic CoO particles to metallic cobalt, which is a ferromagnet, is discovered.

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ACKNOWLEDGMENTS

The authors are grateful to A.M. Rogov and V.G. Evtyugin for the characterization of the samples using electron microscopy.

Funding

The study was carried out at the expense of a subsidy allocated to Kazan Federal University for the fulfillment of the state task in the field of scientific activity no. FZSM-2020-0050.

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Authors and Affiliations

  1. Kazan Federal University, 420008, Kazan, Russia

    M. Saad, A. G. Kiiamov, S. I. Nikitin, D. A. Tayurskii & R. V. Yusupov

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  1. M. Saad
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  2. A. G. Kiiamov
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  3. S. I. Nikitin
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  4. D. A. Tayurskii
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  5. R. V. Yusupov
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Correspondence to M. Saad.

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Translated by S. Rostovtseva

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Saad, M., Kiiamov, A.G., Nikitin, S.I. et al. Ferromagnetism of Graphite Nanopowders with Cobalt Oxide Impurity and Its Evolution at Moderate Annealing. Inorg. Mater. Appl. Res. 14, 118–122 (2023). https://doi.org/10.1134/S207511332301032X

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  • DOI: https://doi.org/10.1134/S207511332301032X

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