Ferrimagnetic clusters as the origin of anomalous Curie-Weiss behavior in ZnFe_2O_4 antiferromagnetic susceptibility



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Hernando Grande, Antonio and Cobos Fernández, Miguel Ángel and Jiménez, José Antonio and Llorente, Irene and García Escorial, Asunción and Presa Muñoz del Toro, Patricia de la (2022) Ferrimagnetic clusters as the origin of anomalous Curie-Weiss behavior in ZnFe_2O_4 antiferromagnetic susceptibility. Materials, 15 (14). ISSN 1996-1944

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Official URL: http://dx.doi.org/10.3390/ma15144789


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.

Uncontrolled Keywords:Magnetic-structure; Ferrite; Zinc ferrite; Curie-Weiss temperature; Inversion degree
Subjects:Sciences > Physics > Materials
Sciences > Physics > Solid state physics
ID Code:74623
Deposited On:21 Sep 2022 17:25
Last Modified:22 Sep 2022 07:52

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