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http://cimav.repositorioinstitucional.mx/jspui/handle/1004/1004| Zn-doping effect on the energy barrier to magnetization reversal in superparamagnetic nickel ferrite nanoparticles | |
| JOSE TRINIDAD ELIZALDE GALINDO | |
| LUIS EDMUNDO FUENTES COBAS JOSE ANDRES MATUTES AQUINO | |
| Acceso Abierto | |
| Sin Derechos Reservados | |
| Nickel | |
| Measurements of ac-susceptibility and dc-magnetization were carried out on samples of Ni1−xZnxFe2O4 nanoparticles (x = 0, 0.25, 0.5, 0.75) with average diameters D ≈ 7 nm. Values of the superparamagnetic blocking temperature TB were obtained from the characteristic temperature behavior of the imaginary susceptibility χimag. An Arrhenius-type law, which accurately describes the relationship between the observation time τobs and the blocking temperature, was used to determine the effective energy barrier to magnetization reversal Ueff. A Zn-content dependence of the energy barrier is observed, where Ueff changes little for 0 ≤ x ≤ 0.25, it peaks at x = 0.5, and decreases back upon further Zn-doping. The large increase of Ueff at x = 0.5 is attributed to an enhanced magnetic anisotropy induced by the crossover between two spatial arrangements of spins in the A and B sub-lattices of the ferrimagnetic inverse spinel. | |
| 2007-05 | |
| Artículo | |
| Inglés | |
| OTRAS | |
| Versión revisada | |
| submittedVersion - Versión revisada | |
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