Тип публикации: статья из журнала
Год издания: 2019
Ключевые слова: coercivity, NiO nanoparticles, pulsed field magnetization
Аннотация: The dynamic magnetization switching of antiferromagnetic nickel oxide nanoparticles with a characteristic size of 8 nm has been experimentally investigated by pulsed field magnetometry. It is shown that, due to the presence of defects in NiO nanoparticles, as in other antiferromagnetic particles, the uncompensated magnetic moment iПоказать полностьюs induced by the incomplete compensation of spins at the antiferromagnetic ordering. The dynamic magnetic hysteresis loops have been studied in pulsed fields with the maximum field (H max ) of up to 130 kOe and pulse lengths (τ P ) of 4, 8, and 16 ms. According to the results obtained, the coercivity (H C ) depends on both the τ P and H max values. The observed increase in the H C value with decreasing pulse length (i.e., with increasing switching field frequency) is unambiguously related with the relaxation processes typical of single-domain ferromagnetic nanoparticles. However, the observed effect of the maximum applied field (H max ) on the H C value is assumed to be a feature of antiferromagnetic nanoparticles.
Журнал: Journal of Superconductivity and Novel Magnetism
Выпуск журнала: Т. 32, № 2
Номера страниц: 405-411
ISSN журнала: 15571939
Издатель: Springer New York LLC