RUO Home

Repositorio Institucional de la Universidad de Oviedo

View Item 
  •   RUO Home
  • Producción Bibliográfica de UniOvi: RECOPILA
  • Artículos
  • View Item
  •   RUO Home
  • Producción Bibliográfica de UniOvi: RECOPILA
  • Artículos
  • View Item
    • español
    • English
JavaScript is disabled for your browser. Some features of this site may not work without it.

Browse

All of RUOCommunities and CollectionsBy Issue DateAuthorsTitlesSubjectsxmlui.ArtifactBrowser.Navigation.browse_issnAuthor profilesThis CollectionBy Issue DateAuthorsTitlesSubjectsxmlui.ArtifactBrowser.Navigation.browse_issn

My Account

LoginRegister

Statistics

View Usage Statistics

RECENTLY ADDED

Last submissions
Repository
How to publish
Resources
FAQs

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

Author:
Rinaldi Montes, Natalia MagdalenaUniovi authority; Gorría Korres, PedroUniovi authority; Martínez Blanco, DavidUniovi authority; Fuertes Arias, Antonio BenitoUniovi authority; Fernández Barquín, Luis; Rodríguez Fernández, Jesús; Pedro del Valle, Imanol de; Fernández Gubieda, M. L.; Alonso, J.; Olivi, Luca; Aquilanti, Giuliana; Blanco Rodríguez, Jesús ÁngelUniovi authority
Publication date:
2014
Editorial:

The Royal Society of Chemistry

Publisher version:
http://dx.doi.org/10.1039/c3nr03961g
Citación:
Nanoscale, 6(1), p. 457-465 (2014); doi:10.1039/c3nr03961g
Descripción física:
p. 457-465
Abstract:

The 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).

The 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).

URI:
http://hdl.handle.net/10651/25359
http://pubs.rsc.org/en/content/articlehtml/2014/nr/c3nr03961g
ISSN:
2040-3364; 2040-3372
Identificador local:

20141220

DOI:
10.1039/c3nr03961g
Patrocinado por:

Ministerio de Educación, Cultura y Deporte (MECD) doctoral grant FPU12/03381. This work was accomplished with financial support from project MAT2011-27573-C04.

Collections
  • Artículos [37532]
  • Física [2002]
Files in this item
Thumbnail
untranslated
Postprint RSC (1.790Mb)
Métricas
Compartir
Exportar a Mendeley
Estadísticas de uso
Estadísticas de uso
Metadata
Show full item record
Página principal Uniovi

Biblioteca

Contacto

Facebook Universidad de OviedoTwitter Universidad de Oviedo
The content of the Repository, unless otherwise specified, is protected with a Creative Commons license: Attribution-Non Commercial-No Derivatives 4.0 Internacional
Creative Commons Image