English   español  
Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/122090
COMPARTIR / IMPACTO:
Estadísticas
logo share SHARE   Add this article to your Mendeley library MendeleyBASE
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:
Título

Magneto-structural correlations in antiferromagnetic and ferrimagnetic nanoparticles

AutorSilva, Nuno Joâo O.; Amaral, Vitor S.; Carlos, Luis D.; Urtizberea, A.; Millán, Ángel; Palacio, Fernando; Kampert, E.; Zeitler, U.; Komorida, Y.; Mito, M.; Iglesias-Freire, Óscar ; Labarta, Amílcar; Puente-Orench, I.; Campo, Javier
Fecha de publicación2012
CitaciónICM 2012
ResumenWe present structural and magnetic studies performed in ferrimagnetic and antiferromagnetic nanoparticles. We focus our attention on the antiferromagnetic ferritin and cobalt oxide and on the ferrimagnetic maghemite. High-field studies in ferritin reveal that the temperature dependence of the antiferromagnetic susceptibility decreases with temperature when correctly determined from high-field data. High-field hysteresis loops also show that coercivity and loop-shifts are a function of the maximum field, which can be understood in the frame of coherent rotation models considering a field-dependent anisotropy energy. Neutron diffraction is particularly effective in the study of structural and magnetic coherence sizes of antiferromagnetic nanoparticles. In the case of cobalt oxide, we found that the difference between both sizes is consistent with a core-shell model where the shell is structurally ordered but magnetically disordered with a thickness of ~2 nm. This core shell model was also successfully applied to a series of maghemite nanoparticles, based on small-angle X-ray scattering and magnetization results, yielding, in this case, a magnetically disordered shell with about 1nm. Surface and core contribution to anisotropy energy in maghemite can be elegantly separated by using pressure, since the core/shell volume ratio changes with pressure inducing a change in the average anisotropy energy.
DescripciónResumen del trabajo presentado a la 19th International Conference on Magnetism celebrada en Korea del 8 al 13 de julio de 2012.
URIhttp://hdl.handle.net/10261/122090
Aparece en las colecciones: (ICMA) Comunicaciones congresos
Ficheros en este ítem:
Fichero Descripción Tamaño Formato  
accesoRestringido.pdf15,38 kBAdobe PDFVista previa
Visualizar/Abrir
Mostrar el registro completo
 


NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.