| Autor: |
Alex Soares de Brito, Marlon Ivan Valerio-Cuadros, Lilian Felipe Silva Tupan, Aline Alves Oliveira, Reginaldo Barco, Flávio Francisco Ivashita, Edson Caetano Passamani, José Humberto de Araújo, Marco Antonio Morales Torres, Andrea Paesano, Jr. |
| Jazyk: |
angličtina |
| Rok vydání: |
2023 |
| Předmět: |
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| Zdroj: |
Heliyon, Vol 9, Iss 12, Pp e22876- (2023) |
| Druh dokumentu: |
article |
| ISSN: |
2405-8440 |
| DOI: |
10.1016/j.heliyon.2023.e22876 |
| Popis: |
Undoped and Fe-doped NiO nanoparticles were successfully synthesized using a lyophilization method and systematically characterized through magnetization techniques over a wide temperature range, with varying intensity and frequency of the applied magnetic fields. The Ni1-xFexO nanoparticles can be described by a core-shell model, which reveals that Fe doping enhances exchange interactions in correlation with nanoparticle size reduction. The nanoparticles exhibit a superparamagnetic blocking transition, primarily attributed to their cores, at temperatures ranging from above room temperature to low temperatures, depending on the Fe-doping level and sample synthesis temperature. The nanoparticle shells also exhibit a transition at low temperatures, in this case to a cluster-glass-like state, caused by the dipolar magnetic interactions between the net magnetic moments of the clusters. Their freezing temperature shifts to higher temperatures as the Fe-doping level increases. The existence of an exchange bias interaction was observed, thus validating the core-shell model proposed. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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