Publication: Ferrimagnetic clusters as the origin of anomalous Curie-Weiss behavior in ZnFe_2O_4 antiferromagnetic susceptibility
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Publication Date
2022-07-08
Authors
Cobos Fernández, Miguel Ángel
Jiménez, José Antonio
Llorente, Irene
García Escorial, Asunción
Presa Muñoz del Toro, Patricia de la
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MDPI AG
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Abstract
Different studies carried out in the last three decades on the magnetic susceptibility of the spinel ZnFe_2O_4 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.
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©2022 by the autor(s), Licensee MDPI
This research was funded by Spanish Ministries of Science Innovation and Universities and of Economy and Competitiveness by means of the AFORMAR (PID2019-109334RB), RTI2018-095303-B-C51 and RTI2018-095856-B-C21 projects. The support of the grants from the Community of Madrid numbers S2018/NMT-4381-MAT4.0-CM and P2018/NMT-4321 is also recognized.