2026-07-24T20:54:00Zhttps://docta.ucm.es/rest/oai/requestoai:docta.ucm.es:20.500.14352/720092026-04-22T12:44:08Zcom_20.500.14352_14col_20.500.14352_15
Ferrimagnetic clusters as the origin of anomalous Curie-Weiss behavior in ZnFe_2O_4 antiferromagnetic susceptibility
Hernando Grande, Antonio
Cobos Fernández, Miguel Ángel
Jiménez, José Antonio
Llorente, Irene
García Escorial, Asunción
Presa Muñoz De Toro, Patricia Marcela De La
©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.
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.
2023-06-22T11:01:03Z
2023-06-22T11:01:03Z
2022-07-08
journal article
1996-1944
10.3390/ma15144789
https://hdl.handle.net/20.500.14352/72009
http://dx.doi.org/10.3390/ma15144789
eng
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/RTI2018-095856-B-C21/ES/DESARROLLO DE MATERIALES MAGNETICOS Y SENSORES PARA APLICACIONES BIOMEDICAS/
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2019-109334RB-C32/ES/DESARROLLO DE NUEVOS ACEROS SINTERIZADOS MARTENSITICOS FORMADORES DE ALUMINA/
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/RTI2018-095303-A-C52/ES/INTERFACIAL MAGNETISM FOR ULTRAFAST AND LOW DISSIPATION SIGNAL PROCESSING DEVICES/
S2018/NMT-4381-MAT4.0-CM; NANOMAGCOST-CM (S2018/NMT-4321)
https://creativecommons.org/licenses/by/3.0/es/
open access
Atribución 3.0 España
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