Magnetic properties of the granular alloy Fe10Ag90 as a function of annealing temperature

Detalhes bibliográficos
Autor(a) principal: Soares,João Maria
Data de Publicação: 2005
Outros Autores: Araújo,José Humberto de, Cabral,Francisco de Assis Olímpio, Dumelow,Thomas, Xavier Júnior,Milton Morais, Sasaki,José Marcos
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Materials research (São Carlos. Online)
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392005000300021
Resumo: Fe10Ag90 granular alloys have been prepared using a sol-gel process, sintered at 300 °C and annealed at temperatures between 400 °C and 700 °C. The mean size of the iron particles, obtained from X-ray diffraction, is 30.0 ± 0.7 nm. Due to the existence of a distribution of particle sizes in these samples, both blocked (BL) and superparamagnetic (SPM) particles are present simultaneously, as confirmed by magnetization measurements at room temperature. AC susceptibility measurements as a function of temperature reveal a magnetic phase transition at about 770 °C, indicating the presence of particles exhibiting bulk behavior, in the samples annealed above 550 °C. The presence of these particles has been attributed to an atomic diffusion process between the grains, forming bulk-like multiple-domain Fe particles having Curie temperatures near that of bulk alpha-Fe phase (T C = 770 °C).
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spelling Magnetic properties of the granular alloy Fe10Ag90 as a function of annealing temperaturesuperparamagnetismgranular alloysize distributionFe10Ag90 granular alloys have been prepared using a sol-gel process, sintered at 300 °C and annealed at temperatures between 400 °C and 700 °C. The mean size of the iron particles, obtained from X-ray diffraction, is 30.0 ± 0.7 nm. Due to the existence of a distribution of particle sizes in these samples, both blocked (BL) and superparamagnetic (SPM) particles are present simultaneously, as confirmed by magnetization measurements at room temperature. AC susceptibility measurements as a function of temperature reveal a magnetic phase transition at about 770 °C, indicating the presence of particles exhibiting bulk behavior, in the samples annealed above 550 °C. The presence of these particles has been attributed to an atomic diffusion process between the grains, forming bulk-like multiple-domain Fe particles having Curie temperatures near that of bulk alpha-Fe phase (T C = 770 °C).ABM, ABC, ABPol2005-09-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392005000300021Materials Research v.8 n.3 2005reponame:Materials research (São Carlos. Online)instname:Universidade Federal de São Carlos (UFSCAR)instacron:ABM ABC ABPOL10.1590/S1516-14392005000300021info:eu-repo/semantics/openAccessSoares,João MariaAraújo,José Humberto deCabral,Francisco de Assis OlímpioDumelow,ThomasXavier Júnior,Milton MoraisSasaki,José Marcoseng2005-10-10T00:00:00Zoai:scielo:S1516-14392005000300021Revistahttp://www.scielo.br/mrPUBhttps://old.scielo.br/oai/scielo-oai.phpdedz@power.ufscar.br1980-53731516-1439opendoar:2005-10-10T00:00Materials research (São Carlos. Online) - Universidade Federal de São Carlos (UFSCAR)false
dc.title.none.fl_str_mv Magnetic properties of the granular alloy Fe10Ag90 as a function of annealing temperature
title Magnetic properties of the granular alloy Fe10Ag90 as a function of annealing temperature
spellingShingle Magnetic properties of the granular alloy Fe10Ag90 as a function of annealing temperature
Soares,João Maria
superparamagnetism
granular alloy
size distribution
title_short Magnetic properties of the granular alloy Fe10Ag90 as a function of annealing temperature
title_full Magnetic properties of the granular alloy Fe10Ag90 as a function of annealing temperature
title_fullStr Magnetic properties of the granular alloy Fe10Ag90 as a function of annealing temperature
title_full_unstemmed Magnetic properties of the granular alloy Fe10Ag90 as a function of annealing temperature
title_sort Magnetic properties of the granular alloy Fe10Ag90 as a function of annealing temperature
author Soares,João Maria
author_facet Soares,João Maria
Araújo,José Humberto de
Cabral,Francisco de Assis Olímpio
Dumelow,Thomas
Xavier Júnior,Milton Morais
Sasaki,José Marcos
author_role author
author2 Araújo,José Humberto de
Cabral,Francisco de Assis Olímpio
Dumelow,Thomas
Xavier Júnior,Milton Morais
Sasaki,José Marcos
author2_role author
author
author
author
author
dc.contributor.author.fl_str_mv Soares,João Maria
Araújo,José Humberto de
Cabral,Francisco de Assis Olímpio
Dumelow,Thomas
Xavier Júnior,Milton Morais
Sasaki,José Marcos
dc.subject.por.fl_str_mv superparamagnetism
granular alloy
size distribution
topic superparamagnetism
granular alloy
size distribution
description Fe10Ag90 granular alloys have been prepared using a sol-gel process, sintered at 300 °C and annealed at temperatures between 400 °C and 700 °C. The mean size of the iron particles, obtained from X-ray diffraction, is 30.0 ± 0.7 nm. Due to the existence of a distribution of particle sizes in these samples, both blocked (BL) and superparamagnetic (SPM) particles are present simultaneously, as confirmed by magnetization measurements at room temperature. AC susceptibility measurements as a function of temperature reveal a magnetic phase transition at about 770 °C, indicating the presence of particles exhibiting bulk behavior, in the samples annealed above 550 °C. The presence of these particles has been attributed to an atomic diffusion process between the grains, forming bulk-like multiple-domain Fe particles having Curie temperatures near that of bulk alpha-Fe phase (T C = 770 °C).
publishDate 2005
dc.date.none.fl_str_mv 2005-09-01
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392005000300021
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392005000300021
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/S1516-14392005000300021
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv text/html
dc.publisher.none.fl_str_mv ABM, ABC, ABPol
publisher.none.fl_str_mv ABM, ABC, ABPol
dc.source.none.fl_str_mv Materials Research v.8 n.3 2005
reponame:Materials research (São Carlos. Online)
instname:Universidade Federal de São Carlos (UFSCAR)
instacron:ABM ABC ABPOL
instname_str Universidade Federal de São Carlos (UFSCAR)
instacron_str ABM ABC ABPOL
institution ABM ABC ABPOL
reponame_str Materials research (São Carlos. Online)
collection Materials research (São Carlos. Online)
repository.name.fl_str_mv Materials research (São Carlos. Online) - Universidade Federal de São Carlos (UFSCAR)
repository.mail.fl_str_mv dedz@power.ufscar.br
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