Abstract
Copper oxide nanoparticles were produced by direct plasmachemical synthesis in a plasma arc discharge of low pressure. The formation of CuO nanoparticles with an average size of 12 nm and narrow size distribution intervals was determined by using the x-ray diffraction analysis and TEM microscopy methods. It was defined by using a vibration magnetometer and a SQUID magnetometer, that the magnetic properties of CuO nanoparticles with such size were extremely different from the magnetic properties of bulk antiferromagnetic CuO. Structural defects caused the formation of a ferromagnetic state, remaining at least up to the room temperature. The temperature of corresponding antiferromagnetic ordering was significantly decreased (down to ∼ 100 K). Meanwhile, some of the copper surface spins showed a spin-glass behavior at low temperatures.
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The work was performed with a support of the grant of the Russian Science Foundation (project no. 16-19-10054)
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Lepeshev, A.A., Karpov, I.V., Ushakov, A.V. et al. Particularities of the Magnetic State of CuO Nanoparticles Produced by Low-Pressure Plasma Arc Discharge. J Supercond Nov Magn 30, 931–936 (2017). https://doi.org/10.1007/s10948-016-3885-4
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DOI: https://doi.org/10.1007/s10948-016-3885-4