Validity of the Néel-Arrhenius model for highly anisotropic CoxFe3−xO4 nanoparticles

Autores
Torres, T.E.; Lima, Enio Junior; Mayoral, A.; Ibarra, A.; Marquina, C.; Ibarra, M.R.; Goya, Gerardo Fabian
Año de publicación
2015
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
We report a systematic study on the structural and magnetic properties of CoxFe3−xO4 magnetic nanoparticles with sizes between 5 and 25 nm, prepared by thermal decomposition of Fe(acac)3 and Co(acac)2. The large magneto-crystalline anisotropy of the synthesized particles resulted in high blocking temperatures (42 K < TB < 345 K for 5 < d < 13 nm) and large coercive fields (HC ≈ 1600 kA/m for T = 5 K). The smallest particles (⟨d⟩=5 nm) revealed the existence of a magnetically hard, spin-disordered surface. The thermal dependence of static and dynamic magnetic properties of the whole series of samples could be explained within the Neel?Arrhenius relaxation framework by including the thermal dependence of the magnetocrystalline anisotropy constant K1(T), without the need of ad-hoc corrections. This approach, using the empirical Brükhatov-Kirensky relation, provided K1(0) values very similar to the bulk material from either static or dynamic magnetic measurements, as well as realistic values for the response times (τ0 ≈ 10−10s). Deviations from the bulk anisotropy values found for the smallest particles could be qualitatively explained based on Zener´s relation between K1(T) and M(T).
Fil: Torres, T.E.. Universidad de Zaragoza. Instituto de Nanociencia de Aragón; España
Fil: Lima, Enio Junior. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Área de Investigación y Aplicaciones No Nucleares. Gerencia de Física. Laboratorio de Resonancias Magnéticas; Argentina
Fil: Mayoral, A.. Universidad de Zaragoza. Instituto de Nanociencia de Aragón; España
Fil: Ibarra, A.. Universidad de Zaragoza. Instituto de Nanociencia de Aragón; España
Fil: Marquina, C.. Consejo Superior de Investigaciones Científicas; España. Universidad de Zaragoza; España
Fil: Ibarra, M.R.. Universidad de Zaragoza. Instituto de Nanociencia de Aragón; España
Fil: Goya, Gerardo Fabian. Universidad de Zaragoza. Instituto de Nanociencia de Aragón; España
Materia
Magnetic Anisotropy
Nanoparticles
Ferrites
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/57149
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/57149
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Validity of the Néel-Arrhenius model for highly anisotropic CoxFe3−xO4 nanoparticlesTorres, T.E.Lima, Enio JuniorMayoral, A.Ibarra, A.Marquina, C.Ibarra, M.R.Goya, Gerardo FabianMagnetic AnisotropyNanoparticlesFerriteshttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1We report a systematic study on the structural and magnetic properties of CoxFe3−xO4 magnetic nanoparticles with sizes between 5 and 25 nm, prepared by thermal decomposition of Fe(acac)3 and Co(acac)2. The large magneto-crystalline anisotropy of the synthesized particles resulted in high blocking temperatures (42 K < TB < 345 K for 5 < d < 13 nm) and large coercive fields (HC ≈ 1600 kA/m for T = 5 K). The smallest particles (⟨d⟩=5 nm) revealed the existence of a magnetically hard, spin-disordered surface. The thermal dependence of static and dynamic magnetic properties of the whole series of samples could be explained within the Neel?Arrhenius relaxation framework by including the thermal dependence of the magnetocrystalline anisotropy constant K1(T), without the need of ad-hoc corrections. This approach, using the empirical Brükhatov-Kirensky relation, provided K1(0) values very similar to the bulk material from either static or dynamic magnetic measurements, as well as realistic values for the response times (τ0 ≈ 10−10s). Deviations from the bulk anisotropy values found for the smallest particles could be qualitatively explained based on Zener´s relation between K1(T) and M(T).Fil: Torres, T.E.. Universidad de Zaragoza. Instituto de Nanociencia de Aragón; EspañaFil: Lima, Enio Junior. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Área de Investigación y Aplicaciones No Nucleares. Gerencia de Física. Laboratorio de Resonancias Magnéticas; ArgentinaFil: Mayoral, A.. Universidad de Zaragoza. Instituto de Nanociencia de Aragón; EspañaFil: Ibarra, A.. Universidad de Zaragoza. Instituto de Nanociencia de Aragón; EspañaFil: Marquina, C.. Consejo Superior de Investigaciones Científicas; España. Universidad de Zaragoza; EspañaFil: Ibarra, M.R.. Universidad de Zaragoza. Instituto de Nanociencia de Aragón; EspañaFil: Goya, Gerardo Fabian. Universidad de Zaragoza. Instituto de Nanociencia de Aragón; EspañaAmerican Institute of Physics2015-11-12info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/57149Torres, T.E.; Lima, Enio Junior; Mayoral, A.; Ibarra, A.; Marquina, C.; et al.; Validity of the Néel-Arrhenius model for highly anisotropic CoxFe3−xO4 nanoparticles; American Institute of Physics; Journal of Applied Physics; 118; 18; 12-11-2015; 183902/1-183902/110021-8979CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://aip.scitation.org/doi/10.1063/1.4935146info:eu-repo/semantics/altIdentifier/doi/10.1063/1.4935146info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-03T10:07:40Zoai:ri.conicet.gov.ar:11336/57149instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-03 10:07:41.106CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Validity of the Néel-Arrhenius model for highly anisotropic CoxFe3−xO4 nanoparticles
title Validity of the Néel-Arrhenius model for highly anisotropic CoxFe3−xO4 nanoparticles
spellingShingle Validity of the Néel-Arrhenius model for highly anisotropic CoxFe3−xO4 nanoparticles
Torres, T.E.
Magnetic Anisotropy
Nanoparticles
Ferrites
title_short Validity of the Néel-Arrhenius model for highly anisotropic CoxFe3−xO4 nanoparticles
title_full Validity of the Néel-Arrhenius model for highly anisotropic CoxFe3−xO4 nanoparticles
title_fullStr Validity of the Néel-Arrhenius model for highly anisotropic CoxFe3−xO4 nanoparticles
title_full_unstemmed Validity of the Néel-Arrhenius model for highly anisotropic CoxFe3−xO4 nanoparticles
title_sort Validity of the Néel-Arrhenius model for highly anisotropic CoxFe3−xO4 nanoparticles
dc.creator.none.fl_str_mv Torres, T.E.
Lima, Enio Junior
Mayoral, A.
Ibarra, A.
Marquina, C.
Ibarra, M.R.
Goya, Gerardo Fabian
author Torres, T.E.
author_facet Torres, T.E.
Lima, Enio Junior
Mayoral, A.
Ibarra, A.
Marquina, C.
Ibarra, M.R.
Goya, Gerardo Fabian
author_role author
author2 Lima, Enio Junior
Mayoral, A.
Ibarra, A.
Marquina, C.
Ibarra, M.R.
Goya, Gerardo Fabian
author2_role author
author
author
author
author
author
dc.subject.none.fl_str_mv Magnetic Anisotropy
Nanoparticles
Ferrites
topic Magnetic Anisotropy
Nanoparticles
Ferrites
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv We report a systematic study on the structural and magnetic properties of CoxFe3−xO4 magnetic nanoparticles with sizes between 5 and 25 nm, prepared by thermal decomposition of Fe(acac)3 and Co(acac)2. The large magneto-crystalline anisotropy of the synthesized particles resulted in high blocking temperatures (42 K < TB < 345 K for 5 < d < 13 nm) and large coercive fields (HC ≈ 1600 kA/m for T = 5 K). The smallest particles (⟨d⟩=5 nm) revealed the existence of a magnetically hard, spin-disordered surface. The thermal dependence of static and dynamic magnetic properties of the whole series of samples could be explained within the Neel?Arrhenius relaxation framework by including the thermal dependence of the magnetocrystalline anisotropy constant K1(T), without the need of ad-hoc corrections. This approach, using the empirical Brükhatov-Kirensky relation, provided K1(0) values very similar to the bulk material from either static or dynamic magnetic measurements, as well as realistic values for the response times (τ0 ≈ 10−10s). Deviations from the bulk anisotropy values found for the smallest particles could be qualitatively explained based on Zener´s relation between K1(T) and M(T).
Fil: Torres, T.E.. Universidad de Zaragoza. Instituto de Nanociencia de Aragón; España
Fil: Lima, Enio Junior. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Área de Investigación y Aplicaciones No Nucleares. Gerencia de Física. Laboratorio de Resonancias Magnéticas; Argentina
Fil: Mayoral, A.. Universidad de Zaragoza. Instituto de Nanociencia de Aragón; España
Fil: Ibarra, A.. Universidad de Zaragoza. Instituto de Nanociencia de Aragón; España
Fil: Marquina, C.. Consejo Superior de Investigaciones Científicas; España. Universidad de Zaragoza; España
Fil: Ibarra, M.R.. Universidad de Zaragoza. Instituto de Nanociencia de Aragón; España
Fil: Goya, Gerardo Fabian. Universidad de Zaragoza. Instituto de Nanociencia de Aragón; España
description We report a systematic study on the structural and magnetic properties of CoxFe3−xO4 magnetic nanoparticles with sizes between 5 and 25 nm, prepared by thermal decomposition of Fe(acac)3 and Co(acac)2. The large magneto-crystalline anisotropy of the synthesized particles resulted in high blocking temperatures (42 K < TB < 345 K for 5 < d < 13 nm) and large coercive fields (HC ≈ 1600 kA/m for T = 5 K). The smallest particles (⟨d⟩=5 nm) revealed the existence of a magnetically hard, spin-disordered surface. The thermal dependence of static and dynamic magnetic properties of the whole series of samples could be explained within the Neel?Arrhenius relaxation framework by including the thermal dependence of the magnetocrystalline anisotropy constant K1(T), without the need of ad-hoc corrections. This approach, using the empirical Brükhatov-Kirensky relation, provided K1(0) values very similar to the bulk material from either static or dynamic magnetic measurements, as well as realistic values for the response times (τ0 ≈ 10−10s). Deviations from the bulk anisotropy values found for the smallest particles could be qualitatively explained based on Zener´s relation between K1(T) and M(T).
publishDate 2015
dc.date.none.fl_str_mv 2015-11-12
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/57149
Torres, T.E.; Lima, Enio Junior; Mayoral, A.; Ibarra, A.; Marquina, C.; et al.; Validity of the Néel-Arrhenius model for highly anisotropic CoxFe3−xO4 nanoparticles; American Institute of Physics; Journal of Applied Physics; 118; 18; 12-11-2015; 183902/1-183902/11
0021-8979
CONICET Digital
CONICET
url http://hdl.handle.net/11336/57149
identifier_str_mv Torres, T.E.; Lima, Enio Junior; Mayoral, A.; Ibarra, A.; Marquina, C.; et al.; Validity of the Néel-Arrhenius model for highly anisotropic CoxFe3−xO4 nanoparticles; American Institute of Physics; Journal of Applied Physics; 118; 18; 12-11-2015; 183902/1-183902/11
0021-8979
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://aip.scitation.org/doi/10.1063/1.4935146
info:eu-repo/semantics/altIdentifier/doi/10.1063/1.4935146
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv American Institute of Physics
publisher.none.fl_str_mv American Institute of Physics
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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score 13.13397

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