Optical and magnetic properties of Co-doped ZnO nanoparticles and the onset of ferromagnetic order
Nenhuma Miniatura disponível
Arquivos
Data
2017
Título da Revista
ISSN da Revista
Título de Volume
Editor
Resumo
In this study, we report on the optical and magnetic properties of Co-doped ZnO nanoparticles with increasing Co-content (CoxZn1−xO; x = 0.000, 0.005, 0.010, 0.030, 0.050, 0.070, and 0.100) synthesized by the combustion reaction method. The X-ray diffraction patterns and the Raman spectra of all samples indicated the formation of the ZnO hexagonal wurtzite phase (space group C46V). The Raman data also show the formation of a secondary Co3O4 phase, which is barely seen in the X-ray spectra. Photoacoustic spectroscopy and electron paramagnetic resonance confirm the presence of the two phases (CoxZn1−xO and Co3O4). Vibrating sample magnetometer measurements performed at room temperature exhibited hysteresis loops, indicating the presence of long-range magnetic ordering in the samples. Analysis of the magnetization as a function of magnetic field and temperature shows that the ferromagnetism in the as-synthesized samples comes from small Co-metallic inclusions, with an estimated radius of about 4.8 nm and blocking temperature around 595 K.
Descrição
Palavras-chave
Citação
CASTRO, T. J. et al. Optical and magnetic properties of Co-doped ZnO nanoparticles and the onset of ferromagnetic order. Journal of Applied Physics, Melville, v. 121, e013904, 2017. DOI: 10.1063/1.4973526. Disponível em: https://pubs.aip.org/aip/jap/article/121/1/013904/145189/Optical-and-magnetic-properties-of-Co-doped-ZnO. Acesso em: 4 set. 2023.
Print: 0021-8979 Electronic: 1089-7550