Peculiarities of magnetic behavior of CuO nanoparticles produced by plasma-arc synthesis in a wide temperature range
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Автор:
Ushakov, A. V.
Karpov, I. V.
Лепешев, Анатолий Александрович
Коллективный автор:
Институт нефти и газа
НОЦ ЮНЕСКО "Новые материалы и технологии"
Дата:
2017-09Журнал:
Journal of Superconductivity and Novel MagnetismКвартиль журнала в Scopus:
Q3Квартиль журнала в Web of Science:
Q3Библиографическое описание:
Ushakov, A. V. Peculiarities of magnetic behavior of CuO nanoparticles produced by plasma-arc synthesis in a wide temperature range [Текст] / A. V. Ushakov, I. V. Karpov, Анатолий Александрович Лепешев // Journal of Superconductivity and Novel Magnetism. — 2017. — С. 1-4Текст статьи не публикуется в открытом доступе в соответствии с политикой журнала.
Аннотация:
Abstract Copper oxide nanoparticles, produced by direct
plasmochemical synthesis in a low-pressure arc discharge
plasma, show a wide variety of magnetic properties depending
on the strength of the external magnetic field and the
temperature. At low strength of the field and throughout
the studied temperature range, the ferromagnetic state dominates.
This state is caused by disordering of the spins on
the surface of the nanoparticles. At high strength of the field
and under temperatures of less than 200 K, nanoparticles
exhibit a paramagnetic state due to the spin-glass behavior
of copper atoms. At high strength of the field (more
than 3 kOe) and under temperatures of above 300 K, the
diamagnetic state of nanoparticles is observed, due to local
eddy currents caused by oxygen vacancies. The temperature
of antiferromagnetic ordering under study is significantly
lowered (down to ∼100 K).