New Insights on the Spin Glass Behavior in Ferrites Nanoparticles
The magnetic properties of nanocrystalline M<sub>x</sub>Fe<sub>3−x</sub>O<sub>4</sub> ferrites with M=Fe, Co, and Zn were investigated. The data support a core–shell model, where the core is ferrimagnetically ordered, and the shell shows a spin glass type behavior...
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| Format: | Article |
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MDPI AG
2022-05-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/12/10/1782 |
| _version_ | 1797497254794231808 |
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| author | Emil Burzo Romulus Tetean |
| author_facet | Emil Burzo Romulus Tetean |
| author_sort | Emil Burzo |
| collection | DOAJ |
| description | The magnetic properties of nanocrystalline M<sub>x</sub>Fe<sub>3−x</sub>O<sub>4</sub> ferrites with M=Fe, Co, and Zn were investigated. The data support a core–shell model, where the core is ferrimagnetically ordered, and the shell shows a spin glass type behavior. The reduced magnetizations of spin glass components follow an m<sub>g</sub> = (1 – <i>b/H</i><sup>−1/2</sup>) field dependence. The b values are strongly correlated with the intensities of exchange interactions. The field dependences of the magnetoresistances of Fe<sub>3</sub>O<sub>4</sub> and Zn<sub>x</sub>Fe<sub>3−x</sub>O<sub>4</sub> nanoparticles pellets, experimentally determined, are well described if instead of the core reduced magnetization, commonly used, that of the shell is taken into account. For similar compositions of the nanoparticles, identical <i>b</i> values are obtained both from magnetization isotherms and magnetoresistances studies. The half-metallic behavior of spinel Fe<sub>3</sub>O<sub>4</sub> based nanoparticles is discussed comparatively with those of double perovskites. |
| first_indexed | 2024-03-10T03:15:49Z |
| format | Article |
| id | doaj.art-e85c527e06304fe68d29caa47bd38ab3 |
| institution | Directory Open Access Journal |
| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-03-10T03:15:49Z |
| publishDate | 2022-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Nanomaterials |
| spelling | doaj.art-e85c527e06304fe68d29caa47bd38ab32023-11-23T12:28:13ZengMDPI AGNanomaterials2079-49912022-05-011210178210.3390/nano12101782New Insights on the Spin Glass Behavior in Ferrites NanoparticlesEmil Burzo0Romulus Tetean1Faculty of Physics, “Babes Bolyai” University, Kogalniceanu 1, 400084 Cluj-Napoca, RomaniaFaculty of Physics, “Babes Bolyai” University, Kogalniceanu 1, 400084 Cluj-Napoca, RomaniaThe magnetic properties of nanocrystalline M<sub>x</sub>Fe<sub>3−x</sub>O<sub>4</sub> ferrites with M=Fe, Co, and Zn were investigated. The data support a core–shell model, where the core is ferrimagnetically ordered, and the shell shows a spin glass type behavior. The reduced magnetizations of spin glass components follow an m<sub>g</sub> = (1 – <i>b/H</i><sup>−1/2</sup>) field dependence. The b values are strongly correlated with the intensities of exchange interactions. The field dependences of the magnetoresistances of Fe<sub>3</sub>O<sub>4</sub> and Zn<sub>x</sub>Fe<sub>3−x</sub>O<sub>4</sub> nanoparticles pellets, experimentally determined, are well described if instead of the core reduced magnetization, commonly used, that of the shell is taken into account. For similar compositions of the nanoparticles, identical <i>b</i> values are obtained both from magnetization isotherms and magnetoresistances studies. The half-metallic behavior of spinel Fe<sub>3</sub>O<sub>4</sub> based nanoparticles is discussed comparatively with those of double perovskites.https://www.mdpi.com/2079-4991/12/10/1782ferrite nanoparticlesmagnetic propertiesspin-glassexchange field |
| spellingShingle | Emil Burzo Romulus Tetean New Insights on the Spin Glass Behavior in Ferrites Nanoparticles Nanomaterials ferrite nanoparticles magnetic properties spin-glass exchange field |
| title | New Insights on the Spin Glass Behavior in Ferrites Nanoparticles |
| title_full | New Insights on the Spin Glass Behavior in Ferrites Nanoparticles |
| title_fullStr | New Insights on the Spin Glass Behavior in Ferrites Nanoparticles |
| title_full_unstemmed | New Insights on the Spin Glass Behavior in Ferrites Nanoparticles |
| title_short | New Insights on the Spin Glass Behavior in Ferrites Nanoparticles |
| title_sort | new insights on the spin glass behavior in ferrites nanoparticles |
| topic | ferrite nanoparticles magnetic properties spin-glass exchange field |
| url | https://www.mdpi.com/2079-4991/12/10/1782 |
| work_keys_str_mv | AT emilburzo newinsightsonthespinglassbehaviorinferritesnanoparticles AT romulustetean newinsightsonthespinglassbehaviorinferritesnanoparticles |