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Interplay between microstructure and magnetism in NiO nanoparticles: breakdown of the antiferromagnetic order

dc.contributor.authorRinaldi Montes, Natalia Magdalena 
dc.contributor.authorGorría Korres, Pedro 
dc.contributor.authorMartínez Blanco, David 
dc.contributor.authorFuertes Arias, Antonio Benito 
dc.contributor.authorFernández Barquín, Luis
dc.contributor.authorRodríguez Fernández, Jesús
dc.contributor.authorPedro del Valle, Imanol de
dc.contributor.authorFernández Gubieda, M. L.
dc.contributor.authorAlonso, J.
dc.contributor.authorOlivi, Luca
dc.contributor.authorAquilanti, Giuliana
dc.contributor.authorBlanco Rodríguez, Jesús Ángel 
dc.date.accessioned2014-04-04T08:15:04Z
dc.date.available2014-04-04T08:15:04Z
dc.date.issued2014
dc.identifier.citationNanoscale, 6(1), p. 457-465 (2014); doi:10.1039/c3nr03961g
dc.identifier.issn2040-3364
dc.identifier.issn2040-3372
dc.identifier.urihttp://hdl.handle.net/10651/25359
dc.identifier.urihttp://pubs.rsc.org/en/content/articlehtml/2014/nr/c3nr03961g
dc.description.abstractThe possibility of tuning the magnetic behaviour of nanostructured 3d transition metal oxides has opened up the path for extensive research activity in the nanoscale world. In this work we report on how the antiferromagnetism of a bulk material can be broken when reducing its size under a given threshold. We combined X-ray diffraction, high-resolution transmission electron microscopy, extended X-ray absorption fine structure and magnetic measurements in order to describe the influence of the microstructure and morphology on the magnetic behaviour of NiO nanoparticles (NPs) with sizes ranging from 2.5 to 9 nm. The present findings reveal that size effects induce surface spin frustration which competes with the expected antiferromagnetic (AFM) order, typical of bulk NiO, giving rise to a threshold size for the AFM phase to nucleate. Ni2+ magnetic moments in 2.5 nm NPs seem to be in a spin glass (SG) state, whereas larger NPs are formed by an uncompensated AFM core with a net magnetic moment surrounded by a SG shell. The coupling at the core–shell interface leads to an exchange bias effect manifested at low temperature as horizontal shifts of the hysteresis loop (∼1 kOe) and a coercivity enhancement (∼0.2 kOe).
dc.description.sponsorshipMinisterio de Educación, Cultura y Deporte (MECD) doctoral grant FPU12/03381. This work was accomplished with financial support from project MAT2011-27573-C04.
dc.format.extentp. 457-465
dc.language.isoeng
dc.publisherThe Royal Society of Chemistry
dc.relation.ispartofNanoscale, 6(1)
dc.rights© The Royal Society of Chemistry 2014
dc.titleInterplay between microstructure and magnetism in NiO nanoparticles: breakdown of the antiferromagnetic order
dc.typejournal article
dc.identifier.local20141220
dc.identifier.doi10.1039/c3nr03961g
dc.relation.projectIDMAT2011-27573-C04
dc.relation.publisherversionhttp://dx.doi.org/10.1039/c3nr03961g
dc.rights.accessRightsopen access
dc.type.hasVersionAM


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