Broadband ferromagnetic resonance in Mn-doped Li ferrite nanoparticles
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arXiv
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| Autori principali: | , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866913237134475264 |
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| author | Hernandez-Gomez, P. Muñoz, J. M. Valente, M. A. Graça, M. P. F. |
| author_facet | Hernandez-Gomez, P. Muñoz, J. M. Valente, M. A. Graça, M. P. F. |
| contents | Lithium ferrites are well known materials due to their numerous technological applications especially in microwave devices. Mn-doped lithium ferrite nanoparticles were prepared by sol-gel technique by means of Pechini method, and then annealed at different temperatures in 250 to 1000 °C range. XRD confirms spinel formation with particle size in the 15 to 200 nm range, with increased size with annealing temperature. Microwave magnetoabsorption data of annealed lithium ferrite nanoparticles, obtained with a broadband system based on a network analyzer operating up to 8.5 GHz are presented. At fields up to 200 mT we can observe a broad absorption peak that shifts to higher frequencies with magnetic field according to ferromagnetic resonance theory. The amplitude of absorption, up to 85%, together with the frequency width of about 4.5 GHz makes this material suitable as wave absorber. Samples annealed at higher temperatures show a behaviour similar to polycrystalline samples, thus suggesting their multidomain character |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2402_12096 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Broadband ferromagnetic resonance in Mn-doped Li ferrite nanoparticles Hernandez-Gomez, P. Muñoz, J. M. Valente, M. A. Graça, M. P. F. Materials Science Applied Physics Lithium ferrites are well known materials due to their numerous technological applications especially in microwave devices. Mn-doped lithium ferrite nanoparticles were prepared by sol-gel technique by means of Pechini method, and then annealed at different temperatures in 250 to 1000 °C range. XRD confirms spinel formation with particle size in the 15 to 200 nm range, with increased size with annealing temperature. Microwave magnetoabsorption data of annealed lithium ferrite nanoparticles, obtained with a broadband system based on a network analyzer operating up to 8.5 GHz are presented. At fields up to 200 mT we can observe a broad absorption peak that shifts to higher frequencies with magnetic field according to ferromagnetic resonance theory. The amplitude of absorption, up to 85%, together with the frequency width of about 4.5 GHz makes this material suitable as wave absorber. Samples annealed at higher temperatures show a behaviour similar to polycrystalline samples, thus suggesting their multidomain character |
| title | Broadband ferromagnetic resonance in Mn-doped Li ferrite nanoparticles |
| topic | Materials Science Applied Physics |
| url | https://arxiv.org/abs/2402.12096 |