Size effects on the Néel temperature of antiferromagnetic NiO nanoparticles

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...

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Bibliographic Details
Published inAIP advances Vol. 6; no. 5; pp. 056104 - 056104-5
Main Authors Rinaldi-Montes, Natalia, Gorria, Pedro, Martínez-Blanco, David, Fuertes, Antonio B., Puente-Orench, Inés, Olivi, Luca, Blanco, Jesús A.
Format Journal Article
LanguageEnglish
Published Melville American Institute of Physics 01.05.2016
AIP Publishing LLC
Subjects
Antiferromagnetism
Critical phenomena
Fine structure
Nanoparticles
Neel temperature
Neutron diffraction
Nickel oxides
Scaling laws
Size effects
Transition metals
X ray absorption
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Summary: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.
ISSN:2158-3226
2158-3226
DOI:10.1063/1.4943062