Synthesis, structural characterization and broadband ferromagnetic resonance in Li ferrite nanoparticles

Detalhes bibliográficos
Autor(a) principal: Hernández-Gómez, P.
Data de Publicação: 2018
Outros Autores: Valente, M.A., Graça, M.P.F., Muñoz, J.M.
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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spelling 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
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instacron_str RCAAP
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reponame_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
collection Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
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