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Magneto-structural correlations in antiferromagnetic and ferrimagnetic nanoparticles

AuthorsSilva, 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, Inés; Campo, Javier
Issue Date2012
CitationICM 2012
AbstractWe 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.
DescriptionResumen del trabajo presentado a la 19th International Conference on Magnetism celebrada en Korea del 8 al 13 de julio de 2012.
Appears in Collections:(ICMA) Comunicaciones congresos
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