Artículo
Comparison of the anisotropy energy obtained from temperature dependent AC and DC magnetometry in iron oxide nanoparticles (IONPs) with controlled dipolar interactions
Rivas Rojas, Patricia C.; Tancredi Gentili, Pablo
; Londoño Calderón, Cesar L.; Moscoso Londoño, Oscar
; Socolovsky, Leandro Martin
Fecha de publicación:
04/2022
Editorial:
Elsevier Science
Revista:
Journal of Magnetism and Magnetic Materials
ISSN:
0304-8853
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
Core-shell structures of two core sizes and three different interparticle distances for each core, provided by individual silica shells, were employed as test bench to compare energetic parameters that can be obtained from DC and AC magnetometry analysis. Samples were structurally characterized through X-Ray powder diffraction (XRD), confirming the spinel structure of the cores with different crystallite sizes and different proportions of amorphous silica. Transmission electron microscopy (TEM) revealed the spherical core–shell structures of the samples with core sizes of 8.5 and 12.6 nm and shells thickness that ranges from 2 to 20 nm. Zero field cooling and field cooling (ZFC-FC) routines, saturation magnetization as a function of temperature and AC susceptibility measurements were analyzed to calculate activation energy values and thermal parameters related to anisotropic contributions, attributed to dipolar and surface effects. Both contributions manifest by shifting and broadening the activation energy distribution and causing a slowing down of the spin-relaxation rate on approaching the critical temperature, a complementary approach is employed to analyze them.
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Articulos(INTECIN)
Articulos de INST.D/TEC.Y CS.DE LA ING."HILARIO FERNANDEZ LONG"
Articulos de INST.D/TEC.Y CS.DE LA ING."HILARIO FERNANDEZ LONG"
Articulos(SEDE CENTRAL)
Articulos de SEDE CENTRAL
Articulos de SEDE CENTRAL
Citación
Rivas Rojas, Patricia C.; Tancredi Gentili, Pablo; Londoño Calderón, Cesar L.; Moscoso Londoño, Oscar; Socolovsky, Leandro Martin; Comparison of the anisotropy energy obtained from temperature dependent AC and DC magnetometry in iron oxide nanoparticles (IONPs) with controlled dipolar interactions; Elsevier Science; Journal of Magnetism and Magnetic Materials; 547; 4-2022; 1-10
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