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Title

Exchange bias in iron oxide nanoclusters

AuthorsSánchez-Marcos, J. ; Laguna-Marco, M. A.; Martínez-Morillas, Rocío ; Céspedes, Eva ; Jiménez-Villacorta, Félix ; Menéndez, N.; Prieto, C.
Issue Date2011
PublisherInstitute of Physics Publishing
CitationJournal of Physics Condensed Matter 23(47): 476003 (2011)
AbstractIron oxide nanoclusters have been prepared by the gas-phase aggregation technique to form thin film structures with very high exchange bias values (up to 3000Oe at low temperatures). Composition has been analysed by x-ray absorption and Mössbauer spectroscopies in order to elucidate the actual origin of the observed magnetic behaviour. The formation of a metaloxide coreshell arrangement to explain the observed exchange bias has to be discarded since results show no metallic iron content and the main presence of α-Fe2O3. The observed weak ferromagnetism and exchange bias are in agreement with the obtained size of α-Fe 2O3 nanoparticles: weak ferromagnetism because of the well-known spin canting in this antiferromagnetic structure and exchange bias because of the interaction between different spin sublattice configurations promoted by the modification of iron coordination in α-Fe 2O3 nanoparticles. Moreover, the preparation method is proposed for tuning both magnetization and exchange bias values by modification of the preparation conditions of α-Fe2O3 nanoparticles, which open new possibilities in the design of new materials with required properties. © 2011 IOP Publishing Ltd.
URIhttp://hdl.handle.net/10261/79008
DOI10.1088/0953-8984/23/47/476003
Identifiersdoi: 10.1088/0953-8984/23/47/476003
issn: 0953-8984
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