Influence of Ag on the Magnetic Anisotropy of Fe3O4 Nanocomposites
| Autor: | Fernanda Antunes Fabian, Cristiane Cupertino Santos Barbosa, Jorge Luiz da Silva Filho, Cristiano T. Meneses, I. M. Costa, J.G.S. Duque, Ana Carla Batista de Jesus, Erilaine Barreto Peixoto, Jonathas Rafael de Jesus |
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| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Thermogravimetric analysis Materials science Spinel Analytical chemistry Nanoparticle Crystal structure engineering.material Condensed Matter Physics 01 natural sciences Electronic Optical and Magnetic Materials Condensed Matter::Materials Science Magnetic anisotropy Phase (matter) 0103 physical sciences engineering Absorption (chemistry) Fourier transform infrared spectroscopy 010306 general physics |
| Zdroj: | Journal of Superconductivity and Novel Magnetism. 32:2471-2477 |
| ISSN: | 1557-1947 1557-1939 |
| Popis: | In this work, the thermal decomposition method is used to obtain Fe3O4-Ag nanocomposites. The weight losses observed in the thermogravimetric measurements are used to estimate the amount of organic mass present in the samples. Fourier-transform infrared (FTIR) spectra show characteristic absorption peaks of the stretching vibration of the Fe-O and C-H groups. Samples are characterized structurally and morphologically by measurements of X-ray diffraction (XRD) and transmission electronic microscopy (TEM), respectively. The XRD patterns indicate the formation of a cubic phase with spinel crystallographic structure. Particles sizes analysis estimated by Scherrer’s equation for Fe3O4 phase show that sizes are unaffected by the Ag-insertion. TEM images reveal that the nanoparticles have a spherical-like shape and a mean particles sizes ranging 3 < d < 4 nm. The best fits of zero-field-cooling and field-cooling (ZFC/FC) curves allow us to state that the magnetic anisotropy constant decreasing as a function of Ag concentration. |
| Databáze: | OpenAIRE |
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