Magnetic properties of Co-doped ZnO nanoparticles
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Data
2017
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Resumo
The magnetism in nanoparticulate powders of Zn1-xCoxO with 0 ≤ ≤ 0.09 x synthesized by a combustion
reaction technique is investigated in a broad range of temperatures (5 ≤ T≤ 750 K) for applied magnetic fields
up to 85 kOe. The hysteresis loops indicated the presence of both ferromagnetic and paramagnetic ordering at
room temperature. An additional antiferromagnetic phase was observed for temperatures below 260 K. A
particle model that can account for the results is that the some of doping Co
2+ ions are not interagent among
themselves, a small quantity form clusters, leading to the ferromagnetic ordering with some of the particles in
the superparamagnetic state, and few others Co
2+ ions form CoO at the grain boundary yielding the
antiferromagnetic phase. It was also found that a modified Langevin function can be used for describing the
H− dependence for magnetization data.
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Zinc oxide, TM-doped, Room temperature ferromagnetism, ZnO, DMS, Combustion reaction
Citação
FRANCO JR., A. et al. Magnetic properties of Co-doped ZnO nanoparticles. Journal of Magnetism and Magnetic Materials, Amsterdam, v. 426, p. 347-350, 2016. DOI: 10.1016/j.jmmm.2016.10.159. Disponível em: https://www.sciencedirect.com/science/article/pii/S0304885316326397. Acesso em: 4 set. 2023.