Crystallographic inversion-mediated superparamagnetic relaxation in Zn-ferrite nanocrystals
Crystallographic inversion induced shift of resonance frequency in zinc ferrite nanoparticle (ZF-NP) samples is studied here. ZF-NP samples were synthesized by a solution-based, low-temperature (<200 °C), microwave-assisted solvothermal (MAS) process. Owing to the far-from-equilibrium processing...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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AIP Publishing LLC
2020-01-01
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| Series: | AIP Advances |
| Online Access: | http://dx.doi.org/10.1063/1.5130483 |
| _version_ | 1828751153730420736 |
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| author | Ranajit Sai Sarath Arackal R. D. Ralandinliu Kahmei Navakanta Bhat Masahiro Yamaguchi S. A. Shivashankar |
| author_facet | Ranajit Sai Sarath Arackal R. D. Ralandinliu Kahmei Navakanta Bhat Masahiro Yamaguchi S. A. Shivashankar |
| author_sort | Ranajit Sai |
| collection | DOAJ |
| description | Crystallographic inversion induced shift of resonance frequency in zinc ferrite nanoparticle (ZF-NP) samples is studied here. ZF-NP samples were synthesized by a solution-based, low-temperature (<200 °C), microwave-assisted solvothermal (MAS) process. Owing to the far-from-equilibrium processing condition, the MAS process produces a very high degree of crystallographic inversion, δ=0.61, in the as-synthesized nanocrystallites. A rapid thermal annealing (RTA) technique was adopted to tune-down crystallographic inversion without altering the crystallite sizes in annealed samples. The crystal structures, particle shapes, and compositions of the nanocrystalline samples were characterized by XRD, SEM and Raman spectroscopy. The samples are phase-pure, with particle size in the range 8-16 nm and their compositions are stoichiometrically accurate. The resonance phenomena in 1 to 10 GHz frequency range was measured by analyzing the impedance mismatch of a microstrip line with the magnetic material loaded on to it. The RTA protocol enables tuning of the resonance phenomena in the ZF-NC samples above 6 GHz with tunable range of ∼500 MHz |
| first_indexed | 2024-12-10T20:49:12Z |
| format | Article |
| id | doaj.art-8facdde2940a405795be2fa83c544e1b |
| institution | Directory Open Access Journal |
| issn | 2158-3226 |
| language | English |
| last_indexed | 2024-12-10T20:49:12Z |
| publishDate | 2020-01-01 |
| publisher | AIP Publishing LLC |
| record_format | Article |
| series | AIP Advances |
| spelling | doaj.art-8facdde2940a405795be2fa83c544e1b2022-12-22T01:34:08ZengAIP Publishing LLCAIP Advances2158-32262020-01-01101015101015101-410.1063/1.5130483Crystallographic inversion-mediated superparamagnetic relaxation in Zn-ferrite nanocrystalsRanajit Sai0Sarath Arackal1R. D. Ralandinliu Kahmei2Navakanta Bhat3Masahiro Yamaguchi4S. A. Shivashankar5Centre for Nano Science and Engineering, Indian Institute of Science, Bengaluru 560012, Karnataka, IndiaCentre for Nano Science and Engineering, Indian Institute of Science, Bengaluru 560012, Karnataka, IndiaCentre for Nano Science and Engineering, Indian Institute of Science, Bengaluru 560012, Karnataka, IndiaCentre for Nano Science and Engineering, Indian Institute of Science, Bengaluru 560012, Karnataka, IndiaDept. of Electrical Engineering, Tohoku University, Sendai 980-8579, Miyagi, JapanCentre for Nano Science and Engineering, Indian Institute of Science, Bengaluru 560012, Karnataka, IndiaCrystallographic inversion induced shift of resonance frequency in zinc ferrite nanoparticle (ZF-NP) samples is studied here. ZF-NP samples were synthesized by a solution-based, low-temperature (<200 °C), microwave-assisted solvothermal (MAS) process. Owing to the far-from-equilibrium processing condition, the MAS process produces a very high degree of crystallographic inversion, δ=0.61, in the as-synthesized nanocrystallites. A rapid thermal annealing (RTA) technique was adopted to tune-down crystallographic inversion without altering the crystallite sizes in annealed samples. The crystal structures, particle shapes, and compositions of the nanocrystalline samples were characterized by XRD, SEM and Raman spectroscopy. The samples are phase-pure, with particle size in the range 8-16 nm and their compositions are stoichiometrically accurate. The resonance phenomena in 1 to 10 GHz frequency range was measured by analyzing the impedance mismatch of a microstrip line with the magnetic material loaded on to it. The RTA protocol enables tuning of the resonance phenomena in the ZF-NC samples above 6 GHz with tunable range of ∼500 MHzhttp://dx.doi.org/10.1063/1.5130483 |
| spellingShingle | Ranajit Sai Sarath Arackal R. D. Ralandinliu Kahmei Navakanta Bhat Masahiro Yamaguchi S. A. Shivashankar Crystallographic inversion-mediated superparamagnetic relaxation in Zn-ferrite nanocrystals AIP Advances |
| title | Crystallographic inversion-mediated superparamagnetic relaxation in Zn-ferrite nanocrystals |
| title_full | Crystallographic inversion-mediated superparamagnetic relaxation in Zn-ferrite nanocrystals |
| title_fullStr | Crystallographic inversion-mediated superparamagnetic relaxation in Zn-ferrite nanocrystals |
| title_full_unstemmed | Crystallographic inversion-mediated superparamagnetic relaxation in Zn-ferrite nanocrystals |
| title_short | Crystallographic inversion-mediated superparamagnetic relaxation in Zn-ferrite nanocrystals |
| title_sort | crystallographic inversion mediated superparamagnetic relaxation in zn ferrite nanocrystals |
| url | http://dx.doi.org/10.1063/1.5130483 |
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