Ferrimagnetic Clusters as the Origin of Anomalous Curie–Weiss Behavior in ZnFe<sub>2</sub>O<sub>4</sub> Antiferromagnetic Susceptibility
Different studies carried out in the last three decades on the magnetic susceptibility of the spinel ZnFe<sub>2</sub>O<sub>4</sub> ferrite have revealed the positive character of its Curie–Weiss temperature, contradicting its observed antiferromagnetic behavior which is chara...
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2022-07-01
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| Online Access: | https://www.mdpi.com/1996-1944/15/14/4789 |
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| author | Antonio Hernando Miguel Ángel Cobos José Antonio Jiménez Irene Llorente Asunción García-Escorial Patricia de la Presa |
| author_facet | Antonio Hernando Miguel Ángel Cobos José Antonio Jiménez Irene Llorente Asunción García-Escorial Patricia de la Presa |
| author_sort | Antonio Hernando |
| collection | DOAJ |
| description | Different studies carried out in the last three decades on the magnetic susceptibility of the spinel ZnFe<sub>2</sub>O<sub>4</sub> 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. |
| first_indexed | 2024-03-09T06:17:43Z |
| format | Article |
| id | doaj.art-5e843d81467a4695962d736c119aa6b0 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-09T06:17:43Z |
| publishDate | 2022-07-01 |
| publisher | MDPI AG |
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| series | Materials |
| spelling | doaj.art-5e843d81467a4695962d736c119aa6b02023-12-03T11:50:40ZengMDPI AGMaterials1996-19442022-07-011514478910.3390/ma15144789Ferrimagnetic Clusters as the Origin of Anomalous Curie–Weiss Behavior in ZnFe<sub>2</sub>O<sub>4</sub> Antiferromagnetic SusceptibilityAntonio Hernando0Miguel Ángel Cobos1José Antonio Jiménez2Irene Llorente3Asunción García-Escorial4Patricia de la Presa5Instituto de Magnetismo Aplicado (UCM-ADIF-CSIC), A6 22,500 Km, 28260 Las Rozas, SpainInstituto de Magnetismo Aplicado (UCM-ADIF-CSIC), A6 22,500 Km, 28260 Las Rozas, SpainCentro Nacional de Investigaciones Metalúrgicas (CENIM-CSIC), Avda. Gregorio del Amo, 8, 28040 Madrid, SpainCentro Nacional de Investigaciones Metalúrgicas (CENIM-CSIC), Avda. Gregorio del Amo, 8, 28040 Madrid, SpainCentro Nacional de Investigaciones Metalúrgicas (CENIM-CSIC), Avda. Gregorio del Amo, 8, 28040 Madrid, SpainInstituto de Magnetismo Aplicado (UCM-ADIF-CSIC), A6 22,500 Km, 28260 Las Rozas, SpainDifferent studies carried out in the last three decades on the magnetic susceptibility of the spinel ZnFe<sub>2</sub>O<sub>4</sub> 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.https://www.mdpi.com/1996-1944/15/14/4789zinc ferriteCurie–Weiss temperatureinversion degree |
| spellingShingle | Antonio Hernando Miguel Ángel Cobos José Antonio Jiménez Irene Llorente Asunción García-Escorial Patricia de la Presa Ferrimagnetic Clusters as the Origin of Anomalous Curie–Weiss Behavior in ZnFe<sub>2</sub>O<sub>4</sub> Antiferromagnetic Susceptibility Materials zinc ferrite Curie–Weiss temperature inversion degree |
| title | Ferrimagnetic Clusters as the Origin of Anomalous Curie–Weiss Behavior in ZnFe<sub>2</sub>O<sub>4</sub> Antiferromagnetic Susceptibility |
| title_full | Ferrimagnetic Clusters as the Origin of Anomalous Curie–Weiss Behavior in ZnFe<sub>2</sub>O<sub>4</sub> Antiferromagnetic Susceptibility |
| title_fullStr | Ferrimagnetic Clusters as the Origin of Anomalous Curie–Weiss Behavior in ZnFe<sub>2</sub>O<sub>4</sub> Antiferromagnetic Susceptibility |
| title_full_unstemmed | Ferrimagnetic Clusters as the Origin of Anomalous Curie–Weiss Behavior in ZnFe<sub>2</sub>O<sub>4</sub> Antiferromagnetic Susceptibility |
| title_short | Ferrimagnetic Clusters as the Origin of Anomalous Curie–Weiss Behavior in ZnFe<sub>2</sub>O<sub>4</sub> Antiferromagnetic Susceptibility |
| title_sort | ferrimagnetic clusters as the origin of anomalous curie weiss behavior in znfe sub 2 sub o sub 4 sub antiferromagnetic susceptibility |
| topic | zinc ferrite Curie–Weiss temperature inversion degree |
| url | https://www.mdpi.com/1996-1944/15/14/4789 |
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