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Evolution of the magnetic structure with chemical composition in spinel iron oxide nanoparticles
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Physics.
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2015 (English)In: Nanoscale, ISSN 2040-3364, E-ISSN 2040-3372, Vol. 7, no 32, p. 13576-13585Article in journal (Refereed) Published
Abstract [en]

Magnetic properties of iron oxide nanoparticles with spinel structure are strictly related to a complex interplay between cationic distribution and the presence of a non-collinear spin structure (spin canting). With the aim to gain better insight into the effect of the magnetic structure on magnetic properties, in this paper we investigated a family of small crystalline ferrite nanoparticles of the formula CoxNi1-xFe2O4 (0 [less-than-or-equal] x [less-than-or-equal] 1) having equal size ([approximate]4.5 nm) and spherical-like shape. The field dependence of magnetization at low temperatures indicated a clear increase of magnetocrystalline anisotropy and saturation magnetization (higher than the bulk value for CoFe2O4: [similar]130 A m2 kg-1) with the increase of cobalt content. The magnetic structure of nanoparticles has been investigated by Mossbauer spectroscopy under an intense magnetic field (8 T) at a low temperature (10 K). The magnetic properties have been explained in terms of an evolution of the magnetic structure with the increase of cobalt content. In addition a direct correlation between cationic distribution and spin canting has been proposed, explaining the presence of a noncollinear spin structure in terms of superexchange interaction energy produced by the average cationic distribution and vacancies in the spinel structure.

Place, publisher, year, edition, pages
The Royal Society of Chemistry , 2015. Vol. 7, no 32, p. 13576-13585
National Category
Physical Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-340445DOI: 10.1039/C5NR02723COAI: oai:DiVA.org:uu-340445DiVA, id: diva2:1178833
Available from: 2018-01-30 Created: 2018-01-30 Last updated: 2018-01-30

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Publisher's full texthttp://dx.doi.org/10.1039/C5NR02723C

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Muscas, Giuseppe

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