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Origin of the magnetic transition at 100 K in epsilon-Fe2O3 nanoparticles studied by x-ray absorption fine structure spectroscopy

AuthorsLópez-Sánchez, J.; Muñoz-Noval, A. ; Castellano, C.; Serrano Rubio, Aída ; Campo, Ángel Adolfo del ; Cabero, M.; Varela, M.; Abuín, V.; de la Figuera, Juan ; Marco, J.F. ; Castro, Germán R. ; Rodríguez de la Fuente, Oscar; Carmona, N.
Issue Date6-Dec-2017
PublisherIOP Publishing
CitationJournal of Physics - Condensed Matter 29(48): 485701 (2017)
AbstractThe current study unveils the structural origin of the magnetic transition of the ε-Fe2O3 polymorph from an incommensurate magnetic order to a collinear ferrimagnetic state at low temperature. The high crystallinity of the samples and the absence of other iron oxide polymorphs have allowed us to carry out temperature-dependent x-ray absorption fine structure spectroscopy experiments out. The deformation of the structure is followed by the Debye–Waller factor for each selected Fe–O and Fe–Fe sub-shell. For nanoparticle sizes between 7 and 15 nm, the structural distortions between the Fete and Fe-D1oc sites are localized in a temperature range before the magnetic transition starts. On the contrary, the inherent interaction between the other sub-shells (named Fe–O1,2 and Fe–Fe1) provokes cooperative magneto-structural changes in the same temperature range. This means that the Fete with Fe-D1oc polyhedron interaction seems to be uncoupled with temperature dealing with these nanoparticle sizes wherein the structural distortions are likely moderate due to surface effects.
Publisher version (URL)https://doi.org/10.1088/1361-648X/aa904b
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