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Ferrimagnetic Clusters as the Origin of Anomalous Curie–Weiss Behavior in ZnFe2O4 Antiferromagnetic Susceptibility

Authors :
Ministerio de Ciencia, Innovación y Universidades (España)
Ministerio de Economía y Competitividad (España)
Comunidad de Madrid
Hernando, A.
Cobos, Miguel Ángel
Jiménez, José Antonio
Llorente, Irene
García Escorial, Asunción
de la Presa, P.
Ministerio de Ciencia, Innovación y Universidades (España)
Ministerio de Economía y Competitividad (España)
Comunidad de Madrid
Hernando, A.
Cobos, Miguel Ángel
Jiménez, José Antonio
Llorente, Irene
García Escorial, Asunción
de la Presa, P.
Publication Year :
2022

Abstract

Different studies carried out in the last three decades on the magnetic susceptibility of the spinel ZnFeO ferrite have revealed the positive character of its Curie–Weiss temperature, contradicting its observed antiferromagnetic behavior which is characterized by a well-defined susceptibility peak centered around the Neel temperature (10 K). Some approaches based on ab initio calculations and mixture of interactions have been attempted to explain this anomaly. This work shows how for very low values of the inversion parameter, the small percentage of Fe atoms located in tetrahedral sites gives rise to the appearance of ferrimagnetic clusters around them. Superparamagnetism of these clusters is the main cause of the anomalous Curie–Weiss behavior. This finding is supported experimentally from the thermal dependence of the inverse susceptibility and its evolution with the degree of inversion.

Details

Database :
OAIster
Publication Type :
Electronic Resource
Accession number :
edsoai.on1373150066
Document Type :
Electronic Resource