Synthesis, structural characterization and broadband ferromagnetic resonance in Li ferrite nanoparticles
Autor(a) principal: | |
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Data de Publicação: | 2018 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10773/37536 |
Resumo: | Lithium ferrites are well known materials due to its numerous technological applications especially in microwave devices. Lithium ferrite nanoparticles were prepared by sol-gel technique by means of Pechini method, and then annealed at different temperatures in 250–1000 °C range. XRD confirms spinel formation with particles sizes in 15–700 nm range, with increased size with annealing temperature, whereas FTIR and Raman measurement confirm that single phase lithium ferrite with ordered cationic structure is obtained. Microwave magnetoabsorption data of the annealed lithium ferrite nanoparticles were obtained with a broadband system based on a network analyzer that operates up to 8.5 GHz. 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 5.5 GHz makes this material suitable as wave absorber. FMR parameters like resonance field, linewidth and broadening are analyzed in order to obtain the characteristic parameters and analyze the microwave behaviour. |
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Synthesis, structural characterization and broadband ferromagnetic resonance in Li ferrite nanoparticlesMagnetically ordered materialsNanostructured materialsOxide materialsSol-gel processesMagnetic measurementsFerromagnetic resonanceLithium ferrites are well known materials due to its numerous technological applications especially in microwave devices. Lithium ferrite nanoparticles were prepared by sol-gel technique by means of Pechini method, and then annealed at different temperatures in 250–1000 °C range. XRD confirms spinel formation with particles sizes in 15–700 nm range, with increased size with annealing temperature, whereas FTIR and Raman measurement confirm that single phase lithium ferrite with ordered cationic structure is obtained. Microwave magnetoabsorption data of the annealed lithium ferrite nanoparticles were obtained with a broadband system based on a network analyzer that operates up to 8.5 GHz. 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 5.5 GHz makes this material suitable as wave absorber. FMR parameters like resonance field, linewidth and broadening are analyzed in order to obtain the characteristic parameters and analyze the microwave behaviour.Elsevier2023-05-05T11:15:35Z2018-10-15T00:00:00Z2018-10-15info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10773/37536eng0925-838810.1016/j.jallcom.2018.06.172Hernández-Gómez, P.Valente, M.A.Graça, M.P.F.Muñoz, J.M.info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-02-22T12:12:36Zoai:ria.ua.pt:10773/37536Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T03:08:09.498163Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Synthesis, structural characterization and broadband ferromagnetic resonance in Li ferrite nanoparticles |
title |
Synthesis, structural characterization and broadband ferromagnetic resonance in Li ferrite nanoparticles |
spellingShingle |
Synthesis, structural characterization and broadband ferromagnetic resonance in Li ferrite nanoparticles Hernández-Gómez, P. Magnetically ordered materials Nanostructured materials Oxide materials Sol-gel processes Magnetic measurements Ferromagnetic resonance |
title_short |
Synthesis, structural characterization and broadband ferromagnetic resonance in Li ferrite nanoparticles |
title_full |
Synthesis, structural characterization and broadband ferromagnetic resonance in Li ferrite nanoparticles |
title_fullStr |
Synthesis, structural characterization and broadband ferromagnetic resonance in Li ferrite nanoparticles |
title_full_unstemmed |
Synthesis, structural characterization and broadband ferromagnetic resonance in Li ferrite nanoparticles |
title_sort |
Synthesis, structural characterization and broadband ferromagnetic resonance in Li ferrite nanoparticles |
author |
Hernández-Gómez, P. |
author_facet |
Hernández-Gómez, P. Valente, M.A. Graça, M.P.F. Muñoz, J.M. |
author_role |
author |
author2 |
Valente, M.A. Graça, M.P.F. Muñoz, J.M. |
author2_role |
author author author |
dc.contributor.author.fl_str_mv |
Hernández-Gómez, P. Valente, M.A. Graça, M.P.F. Muñoz, J.M. |
dc.subject.por.fl_str_mv |
Magnetically ordered materials Nanostructured materials Oxide materials Sol-gel processes Magnetic measurements Ferromagnetic resonance |
topic |
Magnetically ordered materials Nanostructured materials Oxide materials Sol-gel processes Magnetic measurements Ferromagnetic resonance |
description |
Lithium ferrites are well known materials due to its numerous technological applications especially in microwave devices. Lithium ferrite nanoparticles were prepared by sol-gel technique by means of Pechini method, and then annealed at different temperatures in 250–1000 °C range. XRD confirms spinel formation with particles sizes in 15–700 nm range, with increased size with annealing temperature, whereas FTIR and Raman measurement confirm that single phase lithium ferrite with ordered cationic structure is obtained. Microwave magnetoabsorption data of the annealed lithium ferrite nanoparticles were obtained with a broadband system based on a network analyzer that operates up to 8.5 GHz. 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 5.5 GHz makes this material suitable as wave absorber. FMR parameters like resonance field, linewidth and broadening are analyzed in order to obtain the characteristic parameters and analyze the microwave behaviour. |
publishDate |
2018 |
dc.date.none.fl_str_mv |
2018-10-15T00:00:00Z 2018-10-15 2023-05-05T11:15:35Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10773/37536 |
url |
http://hdl.handle.net/10773/37536 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
0925-8388 10.1016/j.jallcom.2018.06.172 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Elsevier |
publisher.none.fl_str_mv |
Elsevier |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
instname_str |
Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
instacron_str |
RCAAP |
institution |
RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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1799137735116587008 |