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journal article·2016-05-01Open access

Size effects on the Néel temperature of antiferromagnetic NiO nanoparticles

Natalia Rinaldi-Montes, Pedro Gorria, David Martínez-Blanco, Antonio B. Fuertes, Inés Puente-Orench, Luca Olivi, Jesús A. Blanco

AIP Advances· Volume 6· Issue 5
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Source abstract

Abstract

Among all antiferromagnetic transition metal monoxides, NiO presents the highest Néel temperature (TN ∼ 525 K). In this work, the size-dependent reduction of TN in NiO nanoparticles with average diameters (D) ranging from 4 to 9 nm is investigated by neutron diffraction. The scaling law followed by TN(D) is in agreement with the Binder theory of critical phenomena in low-dimensional systems. X-ray absorption fine structure measurements link the decrease of TN to the occurrence of size effects (average undercoordination, bond relaxation and static disorder) in the nearest and next-nearest Ni coordination shells that hold the key for the maintenance of the antiferromagnetic order.
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Research context

Nanomaterials

OpenAlex topics: Transition Metal Oxide Nanomaterials · Advanced Condensed Matter Physics · ZnO doping and properties

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Universidad de Oviedo 1 Departamento de Física, , E-33007 Oviedo, Spain

Universidad de Oviedo 2 Departamento de Física & IUTA, EPI, , E-33203 Gijón, Spain

Universidad de Oviedo 3 Servicios Científico-Técnicos, , E-33006 Oviedo, Spain

CSIC 4 Instituto Nacional del Carbón, , E-33080 Oviedo, Spain

CSIC-Universidad de Zaragoza and Institut Laue-Langevin 5 Instituto de Ciencia de Materiales de Aragón, , BP 156, F-38042 Grenoble Cedex 9, France

Elettra-Sincrotrone Trieste S.C.p.A. 6 , 34149 Basovizza, Trieste, Italy

Funding

Asturias Government · MINECO · Ministerio de Educacion, Cultura y Deporte

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