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http://cimav.repositorioinstitucional.mx/jspui/handle/1004/1018| Ac susceptibility study of a magnetite magnetic fluid | |
| OSCAR EDUARDO AYALA VALENZUELA JOSE ANDRES MATUTES AQUINO JOSE TRINIDAD ELIZALDE GALINDO | |
| Acceso Abierto | |
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| Magnetic fluid | |
| Magnetite nanometric powder was synthesized from metal salts using a coprecipitation technique. The powders were used to produce magnetic fluid via a peptization method, with hydrocarbon Isopar M as liquid carrier and oleic acid as surfactant. The complex magnetic susceptibility X=X’+iX’’ was measured as a function of temperature T in steps of 2.5 K from 3 to 298 K for frequencies ranging from f =10 to 10 000 Hz. The magnetic fluid real and imaginary components of the ac susceptibility show a prominent maximum at temperatures that increase with the measuring frequency, which is attributed to a spin-glass-like behavior. The peak temperature Tp1 of X’’ depends on f following the Vogel–Fulcher law f = f0 exp[E/kB(Tp1−T0)], where f0 and E are positive constants and T0 is a parameter related to particle interactions. There is another kind of peak temperature, Tp2, in the loss factor tan S=X’’ / X’ which is related to a magnetic aftereffect. The peak temperature Tp2 is far less than Tp1 and shows an Arrhenius-type dependence on f. | |
| 2009 | |
| Artículo | |
| Inglés | |
| OTRAS | |
| Versión revisada | |
| submittedVersion - Versión revisada | |
| Aparece en las colecciones: | Artículos |
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| Ac susceptibility study of a magnetite magnetic fluid PDF 2009.pdf | 307.8 kB | Adobe PDF | Visualizar/Abrir |