Particularities of the Magnetic State of CuO Nanoparticles Produced by Low-Pressure Plasma Arc Discharge

Lepeshev, A. A.; Karpov, I. V.; Ushakov, A. V.; Balaev, D. A.; Krasikov, A. A.; Dubrovskiy, A. A.; Velikanov, D. A.; Petrov, M. I. JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM, 30 (4):931-936; Doi: 10.1007/s10948-016-3885-4 APR 2017

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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