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Broadband Electron Spin Resonance Study in a Sr(2)FeMoO(6) Double Perovskite
[Image: see text] We report broadband magnetic resonance in polycrystalline Sr(2)FeMoO(6) measured over the wide temperature (T = 10–370 K) and frequency (f = 2–18 GHz) ranges. Sr(2)FeMoO(6) was synthesized by the sol–gel method and found to be ferromagnetic below T(C) = 325 K. A coplanar waveguide-...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
American Chemical Society
2020
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7377272/ https://www.ncbi.nlm.nih.gov/pubmed/32715246 http://dx.doi.org/10.1021/acsomega.0c02070 |
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author | Das, Rajasree Chaudhuri, Ushnish Chanda, Amit Mahendiran, Ramanathan |
author_facet | Das, Rajasree Chaudhuri, Ushnish Chanda, Amit Mahendiran, Ramanathan |
author_sort | Das, Rajasree |
collection | PubMed |
description | [Image: see text] We report broadband magnetic resonance in polycrystalline Sr(2)FeMoO(6) measured over the wide temperature (T = 10–370 K) and frequency (f = 2–18 GHz) ranges. Sr(2)FeMoO(6) was synthesized by the sol–gel method and found to be ferromagnetic below T(C) = 325 K. A coplanar waveguide-based broadband spectrometer was used to record the broadband electron spin resonance (ESR) both in frequency sweep and field sweep modes. From the frequency sweep mode at fixed dc magnetic fields, we obtain the spectroscopic splitting factor g ∼ 2.02 for T ≥ T(C) K, which confirms the 3+ ionic state of Fe in the material. The effective g value was found to decrease monotonically with decreasing temperature in the ferromagnetic regime. Resonance frequency decreases and the line width of the spectra increases as the temperature decreases below T(C). At room temperature (RT) and above, the line width (ΔH) of the ESR signal increases linearly with frequency, giving Gilbert damping constant α ∼0.032 ± 0.005 at RT. However, at lower temperatures, a minimum emerges in the ΔH vs frequency curve, and the minimum shifts to a higher frequency with decreasing temperature, confining the linear frequency regime to a narrow-frequency regime. Additional inhomogeneous broadening and low-field-loss terms are needed to describe the line width in the entire frequency range. |
format | Online Article Text |
id | pubmed-7377272 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | American Chemical Society |
record_format | MEDLINE/PubMed |
spelling | pubmed-73772722020-07-24 Broadband Electron Spin Resonance Study in a Sr(2)FeMoO(6) Double Perovskite Das, Rajasree Chaudhuri, Ushnish Chanda, Amit Mahendiran, Ramanathan ACS Omega [Image: see text] We report broadband magnetic resonance in polycrystalline Sr(2)FeMoO(6) measured over the wide temperature (T = 10–370 K) and frequency (f = 2–18 GHz) ranges. Sr(2)FeMoO(6) was synthesized by the sol–gel method and found to be ferromagnetic below T(C) = 325 K. A coplanar waveguide-based broadband spectrometer was used to record the broadband electron spin resonance (ESR) both in frequency sweep and field sweep modes. From the frequency sweep mode at fixed dc magnetic fields, we obtain the spectroscopic splitting factor g ∼ 2.02 for T ≥ T(C) K, which confirms the 3+ ionic state of Fe in the material. The effective g value was found to decrease monotonically with decreasing temperature in the ferromagnetic regime. Resonance frequency decreases and the line width of the spectra increases as the temperature decreases below T(C). At room temperature (RT) and above, the line width (ΔH) of the ESR signal increases linearly with frequency, giving Gilbert damping constant α ∼0.032 ± 0.005 at RT. However, at lower temperatures, a minimum emerges in the ΔH vs frequency curve, and the minimum shifts to a higher frequency with decreasing temperature, confining the linear frequency regime to a narrow-frequency regime. Additional inhomogeneous broadening and low-field-loss terms are needed to describe the line width in the entire frequency range. American Chemical Society 2020-07-08 /pmc/articles/PMC7377272/ /pubmed/32715246 http://dx.doi.org/10.1021/acsomega.0c02070 Text en Copyright © 2020 American Chemical Society This is an open access article published under an ACS AuthorChoice License (http://pubs.acs.org/page/policy/authorchoice_termsofuse.html) , which permits copying and redistribution of the article or any adaptations for non-commercial purposes. |
spellingShingle | Das, Rajasree Chaudhuri, Ushnish Chanda, Amit Mahendiran, Ramanathan Broadband Electron Spin Resonance Study in a Sr(2)FeMoO(6) Double Perovskite |
title | Broadband Electron Spin Resonance Study in a Sr(2)FeMoO(6) Double Perovskite |
title_full | Broadband Electron Spin Resonance Study in a Sr(2)FeMoO(6) Double Perovskite |
title_fullStr | Broadband Electron Spin Resonance Study in a Sr(2)FeMoO(6) Double Perovskite |
title_full_unstemmed | Broadband Electron Spin Resonance Study in a Sr(2)FeMoO(6) Double Perovskite |
title_short | Broadband Electron Spin Resonance Study in a Sr(2)FeMoO(6) Double Perovskite |
title_sort | broadband electron spin resonance study in a sr(2)femoo(6) double perovskite |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7377272/ https://www.ncbi.nlm.nih.gov/pubmed/32715246 http://dx.doi.org/10.1021/acsomega.0c02070 |
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