Microstructural, Morphological, and Magnetic Effects of NiFe<sub>2</sub>O<sub>4</sub> Shell Formation Around Nanospherical ZnFe<sub>2</sub>O<sub>4</sub> Cores
First-row transition metal oxides have relatively modest magnetic properties compared to those of permanent magnets based on rare earth elements. However, there is a hope that this gap might be bridged via proper compositional and structural adjustments. Bi-magnetic nanostructures with homogeneous i...
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MDPI AG
2025-01-01
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| Series: | Magnetochemistry |
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| Online Access: | https://www.mdpi.com/2312-7481/11/1/2 |
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| author | Marija Šuljagić Vuk Uskoković Lukasz Kilanski Sabina Lewinska Abdul Khaliq Anna Ślawska-Waniewska Aleksandar Kremenović Vladimir Pavlović Dejan A. Jeremić Ljubica Andjelković |
| author_facet | Marija Šuljagić Vuk Uskoković Lukasz Kilanski Sabina Lewinska Abdul Khaliq Anna Ślawska-Waniewska Aleksandar Kremenović Vladimir Pavlović Dejan A. Jeremić Ljubica Andjelković |
| author_sort | Marija Šuljagić |
| collection | DOAJ |
| description | First-row transition metal oxides have relatively modest magnetic properties compared to those of permanent magnets based on rare earth elements. However, there is a hope that this gap might be bridged via proper compositional and structural adjustments. Bi-magnetic nanostructures with homogeneous interfaces often exhibit a combination or synergy of properties of both phases, resulting in improved performance compared to their monophasic magnetic counterparts. To gain a deeper insight into these complex structures, a bi-magnetic nanostructured material composed of superparamagnetic nanoparticles comprising a zinc ferrite core and a nickel ferrite shell was synthesized using the seed-mediated growth approach. The resulting ZnFe<sub>2</sub>O<sub>4</sub>@NiFe<sub>2</sub>O<sub>4</sub> core–shell nanoparticles were characterized using a series of experimental techniques and were compared to the ZnFe<sub>2</sub>O<sub>4</sub> cores. Most importantly, the formation of the NiFe<sub>2</sub>O<sub>4</sub> shell around the ZnFe<sub>2</sub>O<sub>4</sub> core improved the net crystallinity of the material and altered the particle morphology by reducing the convexity of the surface. Simultaneously, the magnetic measurements demonstrated the coherence of the interface between the core and the shell. These effects combined led to improved spin coupling and stronger magnetism, as evidenced by higher saturation magnetization and the doubling of the blocking temperature for the ZnFe<sub>2</sub>O<sub>4</sub>@NiFe<sub>2</sub>O<sub>4</sub> core–shell particles relative to the ZnFe<sub>2</sub>O<sub>4</sub> cores. |
| format | Article |
| id | doaj-art-0339d2dcf09a4da5bcccc81a433b9c14 |
| institution | Kabale University |
| issn | 2312-7481 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Magnetochemistry |
| spelling | doaj-art-0339d2dcf09a4da5bcccc81a433b9c142025-01-24T13:39:23ZengMDPI AGMagnetochemistry2312-74812025-01-01111210.3390/magnetochemistry11010002Microstructural, Morphological, and Magnetic Effects of NiFe<sub>2</sub>O<sub>4</sub> Shell Formation Around Nanospherical ZnFe<sub>2</sub>O<sub>4</sub> CoresMarija Šuljagić0Vuk Uskoković1Lukasz Kilanski2Sabina Lewinska3Abdul Khaliq4Anna Ślawska-Waniewska5Aleksandar Kremenović6Vladimir Pavlović7Dejan A. Jeremić8Ljubica Andjelković9Department of Chemistry, Institute of Chemistry, Technology and Metallurgy, University of Belgrade, Njegoševa 12, 11000 Belgrade, SerbiaTardigradeNano LLC, Irvine, CA 92604, USAInstitute of Physics, Polish Academy of Sciences, Aleja Lotnikow 32/46, PL-02668 Warsaw, PolandInstitute of Physics, Polish Academy of Sciences, Aleja Lotnikow 32/46, PL-02668 Warsaw, PolandInstitute of Physics, Polish Academy of Sciences, Aleja Lotnikow 32/46, PL-02668 Warsaw, PolandInstitute of Physics, Polish Academy of Sciences, Aleja Lotnikow 32/46, PL-02668 Warsaw, PolandFaculty of Mining and Geology, University of Belgrade, Djušina 7, 11000 Belgrade, SerbiaFaculty of Agriculture, University of Belgrade, Nemanjina 6, 11000 Belgrade, SerbiaInnovation Center of the Faculty of Chemistry, University of Belgrade, Studentski Trg 12–16, 11000 Belgrade, SerbiaDepartment of Chemistry, Institute of Chemistry, Technology and Metallurgy, University of Belgrade, Njegoševa 12, 11000 Belgrade, SerbiaFirst-row transition metal oxides have relatively modest magnetic properties compared to those of permanent magnets based on rare earth elements. However, there is a hope that this gap might be bridged via proper compositional and structural adjustments. Bi-magnetic nanostructures with homogeneous interfaces often exhibit a combination or synergy of properties of both phases, resulting in improved performance compared to their monophasic magnetic counterparts. To gain a deeper insight into these complex structures, a bi-magnetic nanostructured material composed of superparamagnetic nanoparticles comprising a zinc ferrite core and a nickel ferrite shell was synthesized using the seed-mediated growth approach. The resulting ZnFe<sub>2</sub>O<sub>4</sub>@NiFe<sub>2</sub>O<sub>4</sub> core–shell nanoparticles were characterized using a series of experimental techniques and were compared to the ZnFe<sub>2</sub>O<sub>4</sub> cores. Most importantly, the formation of the NiFe<sub>2</sub>O<sub>4</sub> shell around the ZnFe<sub>2</sub>O<sub>4</sub> core improved the net crystallinity of the material and altered the particle morphology by reducing the convexity of the surface. Simultaneously, the magnetic measurements demonstrated the coherence of the interface between the core and the shell. These effects combined led to improved spin coupling and stronger magnetism, as evidenced by higher saturation magnetization and the doubling of the blocking temperature for the ZnFe<sub>2</sub>O<sub>4</sub>@NiFe<sub>2</sub>O<sub>4</sub> core–shell particles relative to the ZnFe<sub>2</sub>O<sub>4</sub> cores.https://www.mdpi.com/2312-7481/11/1/2magnetically ordered materialsoxide materialschemical synthesisexchange and superexchangemagnetic measurements |
| spellingShingle | Marija Šuljagić Vuk Uskoković Lukasz Kilanski Sabina Lewinska Abdul Khaliq Anna Ślawska-Waniewska Aleksandar Kremenović Vladimir Pavlović Dejan A. Jeremić Ljubica Andjelković Microstructural, Morphological, and Magnetic Effects of NiFe<sub>2</sub>O<sub>4</sub> Shell Formation Around Nanospherical ZnFe<sub>2</sub>O<sub>4</sub> Cores Magnetochemistry magnetically ordered materials oxide materials chemical synthesis exchange and superexchange magnetic measurements |
| title | Microstructural, Morphological, and Magnetic Effects of NiFe<sub>2</sub>O<sub>4</sub> Shell Formation Around Nanospherical ZnFe<sub>2</sub>O<sub>4</sub> Cores |
| title_full | Microstructural, Morphological, and Magnetic Effects of NiFe<sub>2</sub>O<sub>4</sub> Shell Formation Around Nanospherical ZnFe<sub>2</sub>O<sub>4</sub> Cores |
| title_fullStr | Microstructural, Morphological, and Magnetic Effects of NiFe<sub>2</sub>O<sub>4</sub> Shell Formation Around Nanospherical ZnFe<sub>2</sub>O<sub>4</sub> Cores |
| title_full_unstemmed | Microstructural, Morphological, and Magnetic Effects of NiFe<sub>2</sub>O<sub>4</sub> Shell Formation Around Nanospherical ZnFe<sub>2</sub>O<sub>4</sub> Cores |
| title_short | Microstructural, Morphological, and Magnetic Effects of NiFe<sub>2</sub>O<sub>4</sub> Shell Formation Around Nanospherical ZnFe<sub>2</sub>O<sub>4</sub> Cores |
| title_sort | microstructural morphological and magnetic effects of nife sub 2 sub o sub 4 sub shell formation around nanospherical znfe sub 2 sub o sub 4 sub cores |
| topic | magnetically ordered materials oxide materials chemical synthesis exchange and superexchange magnetic measurements |
| url | https://www.mdpi.com/2312-7481/11/1/2 |
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