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http://cimav.repositorioinstitucional.mx/jspui/handle/1004/1070| Magnetic susceptibility studies of the spin-glass and Verwey transitions in magnetite nanoparticles | |
| Karmen Liliana Lopez Maldonado EDITH FLORES TAVIZON JOSE RURIK FARIAS MANCILLA JOSE ANDRES MATUTES AQUINO JOSE TRINIDAD ELIZALDE GALINDO | |
| Acceso Abierto | |
| Sin Derechos Reservados | |
| Spin-glass | |
| Magnetite nanostructured powder samples were synthesized by aging chemical method. Phase, structural, and magnetic properties were characterized. X-ray diffraction patterns showed cubic magnetite pure phase, with average crystallite size, <D>, equal to 40 nm. Susceptibility measurements showed the well-known Verwey transition at a temperature of 90 K. The decrease of Verwey transition temperature, with respect to the one reported in literature (125 K) was attributed to the low average crystallite size. Moreover, the spin-glass like transition was observed at 35 K. Activation energy calculated from susceptibility curves, with values ranging from 6.26 to 6.93 meV, showed a dependence of spin-glass transition on frequency. Finally, hysteresis loops showed that there is not an effect of Verwey transition on magnetic properties. On the other hand, a large increase of coercivity and remanent magnetization at a temperature between 5 and 50K confirmed the presence of a magnetic transition at low temperatures. | |
| 2012 | |
| Artículo | |
| Inglés | |
| OTRAS | |
| Versión revisada | |
| submittedVersion - Versión revisada | |
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| Magnetic susceptibility studies of the spin-glass PDF 2012.pdf | 452.1 kB | Adobe PDF | Visualizar/Abrir |