New Insights into the Magnetic Properties of CoFe<sub>2</sub>O<sub>4</sub>@SiO<sub>2</sub>@Au Magnetoplasmonic Nanoparticles
We report the successful synthesis and a complete magnetic characterization of CoFe<sub>2</sub>O<sub>4</sub>@SiO<sub>2</sub>@Au magnetoplasmonic nanoparticles. The CoFe<sub>2</sub>O<sub>4</sub> magnetic nanoparticles were prepared using the...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-03-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/12/6/942 |
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| author | Rareș Bortnic Adam Szatmari Gabriela Souca Răzvan Hirian Roxana Dudric Lucian Barbu-Tudoran Valentin Toma Rareș Știufiuc Romulus Tetean Emil Burzo |
| author_facet | Rareș Bortnic Adam Szatmari Gabriela Souca Răzvan Hirian Roxana Dudric Lucian Barbu-Tudoran Valentin Toma Rareș Știufiuc Romulus Tetean Emil Burzo |
| author_sort | Rareș Bortnic |
| collection | DOAJ |
| description | We report the successful synthesis and a complete magnetic characterization of CoFe<sub>2</sub>O<sub>4</sub>@SiO<sub>2</sub>@Au magnetoplasmonic nanoparticles. The CoFe<sub>2</sub>O<sub>4</sub> magnetic nanoparticles were prepared using the hydrothermal method. A subsequent SiO<sub>2</sub> shell followed by a plasmonic Au shell were deposited on the magnetic core creating magnetoplasmonic nanoparticles with a core–shell architecture. A spin-glass-type magnetism was shown at the surface of the CoFe<sub>2</sub>O<sub>4</sub> nanograins. Depending on the external magnetic field, two types of spin-glass were identified and analyzed in correlation with the exchange field acting on octahedral and tetrahedral iron sites. The magnetization per formula unit of the CoFe<sub>2</sub>O<sub>4</sub> core is not changed in the case of CoFe<sub>2</sub>O<sub>4</sub>@SiO<sub>2</sub>@Au nanocomposites. The gold nanoparticles creating the plasmonic shell show a giant diamagnetic susceptibility, dependent on their crystallite sizes. |
| first_indexed | 2024-03-09T13:07:43Z |
| format | Article |
| id | doaj.art-7aa8d64b8ca849c1b5ec407acf43d4a9 |
| institution | Directory Open Access Journal |
| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-03-09T13:07:43Z |
| publishDate | 2022-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Nanomaterials |
| spelling | doaj.art-7aa8d64b8ca849c1b5ec407acf43d4a92023-11-30T21:45:53ZengMDPI AGNanomaterials2079-49912022-03-0112694210.3390/nano12060942New Insights into the Magnetic Properties of CoFe<sub>2</sub>O<sub>4</sub>@SiO<sub>2</sub>@Au Magnetoplasmonic NanoparticlesRareș Bortnic0Adam Szatmari1Gabriela Souca2Răzvan Hirian3Roxana Dudric4Lucian Barbu-Tudoran5Valentin Toma6Rareș Știufiuc7Romulus Tetean8Emil Burzo9Faculty of Physics, “Babes Bolyai” University, 400084 Cluj-Napoca, RomaniaFaculty of Physics, “Babes Bolyai” University, 400084 Cluj-Napoca, RomaniaFaculty of Physics, “Babes Bolyai” University, 400084 Cluj-Napoca, RomaniaFaculty of Physics, “Babes Bolyai” University, 400084 Cluj-Napoca, RomaniaFaculty of Physics, “Babes Bolyai” University, 400084 Cluj-Napoca, RomaniaElectron Microscopy Center “Prof. C. Crăciun”, Faculty of Biology & Geology, “Babes-Bolyai” University, 400006 Cluj-Napoca, RomaniaDepartment of Bionanoscopy, MedFuture Research Center for Advance Medicine, “Iuliu Hatieganu” University of Medicine and Pharmacy, 400337 Cluj-Napoca, RomaniaDepartment of Bionanoscopy, MedFuture Research Center for Advance Medicine, “Iuliu Hatieganu” University of Medicine and Pharmacy, 400337 Cluj-Napoca, RomaniaFaculty of Physics, “Babes Bolyai” University, 400084 Cluj-Napoca, RomaniaFaculty of Physics, “Babes Bolyai” University, 400084 Cluj-Napoca, RomaniaWe report the successful synthesis and a complete magnetic characterization of CoFe<sub>2</sub>O<sub>4</sub>@SiO<sub>2</sub>@Au magnetoplasmonic nanoparticles. The CoFe<sub>2</sub>O<sub>4</sub> magnetic nanoparticles were prepared using the hydrothermal method. A subsequent SiO<sub>2</sub> shell followed by a plasmonic Au shell were deposited on the magnetic core creating magnetoplasmonic nanoparticles with a core–shell architecture. A spin-glass-type magnetism was shown at the surface of the CoFe<sub>2</sub>O<sub>4</sub> nanograins. Depending on the external magnetic field, two types of spin-glass were identified and analyzed in correlation with the exchange field acting on octahedral and tetrahedral iron sites. The magnetization per formula unit of the CoFe<sub>2</sub>O<sub>4</sub> core is not changed in the case of CoFe<sub>2</sub>O<sub>4</sub>@SiO<sub>2</sub>@Au nanocomposites. The gold nanoparticles creating the plasmonic shell show a giant diamagnetic susceptibility, dependent on their crystallite sizes.https://www.mdpi.com/2079-4991/12/6/942core–shell nanoparticlesmagnetoplasmonic nanoparticlesmagnetic propertiesspin-glassexchange field |
| spellingShingle | Rareș Bortnic Adam Szatmari Gabriela Souca Răzvan Hirian Roxana Dudric Lucian Barbu-Tudoran Valentin Toma Rareș Știufiuc Romulus Tetean Emil Burzo New Insights into the Magnetic Properties of CoFe<sub>2</sub>O<sub>4</sub>@SiO<sub>2</sub>@Au Magnetoplasmonic Nanoparticles Nanomaterials core–shell nanoparticles magnetoplasmonic nanoparticles magnetic properties spin-glass exchange field |
| title | New Insights into the Magnetic Properties of CoFe<sub>2</sub>O<sub>4</sub>@SiO<sub>2</sub>@Au Magnetoplasmonic Nanoparticles |
| title_full | New Insights into the Magnetic Properties of CoFe<sub>2</sub>O<sub>4</sub>@SiO<sub>2</sub>@Au Magnetoplasmonic Nanoparticles |
| title_fullStr | New Insights into the Magnetic Properties of CoFe<sub>2</sub>O<sub>4</sub>@SiO<sub>2</sub>@Au Magnetoplasmonic Nanoparticles |
| title_full_unstemmed | New Insights into the Magnetic Properties of CoFe<sub>2</sub>O<sub>4</sub>@SiO<sub>2</sub>@Au Magnetoplasmonic Nanoparticles |
| title_short | New Insights into the Magnetic Properties of CoFe<sub>2</sub>O<sub>4</sub>@SiO<sub>2</sub>@Au Magnetoplasmonic Nanoparticles |
| title_sort | new insights into the magnetic properties of cofe sub 2 sub o sub 4 sub sio sub 2 sub au magnetoplasmonic nanoparticles |
| topic | core–shell nanoparticles magnetoplasmonic nanoparticles magnetic properties spin-glass exchange field |
| url | https://www.mdpi.com/2079-4991/12/6/942 |
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