Effect of Thermal Fluctuations in FMR Experiments in Uniaxial Magnetic Nanoparticles: Blocked vs. Superparamagnetic Regimes
- Autores
- de Biasi, Emilio; Lima Jr., Enio; Ramos, Carlos A.; Butera, Alejandro Ricardo; Zysler, Roberto Daniel
- Año de publicación
- 2013
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- We present ferromagnetic resonance (FMR) experiments on two low-interacting nanoparticle systems: Fe3O4 and CoFe2O4 corresponding to low- and high-anisotropy cases, respectively. The spectra have been interpreted in terms of a phenomenological model which applies to the FMR of nanoparticles. The model includes the effect of thermal fluctuations in the FMR covering the range from the superparamagnetic (low-anisotropy-high-temperature) regime to the high-anisotropy-low-temperature situation. We have been able to explain several simultaneous features observed in the FMR spectra of a system of anisotropic nanoparticles when lowering the temperature that include: a decrease of the resonance field with a simultaneous linewidth increase and intensity reduction. These effects had been previously attributed to the existence of a ‘‘blocking-temperature’’ in the FMR. Our interpretation, however, shows that in a magnetic system with easy axes this FMR response originates in the temperature dependence of the dispersion relation. Also, applying the present model to the FMR within the hysteresis cycle it is possible to reproduce the irreversibilities occurring in the resonance spectra. Comparison of FMR and magnetization measurements show that the characteristic FMR time is not related to the inverse microwave frequency.
Fil: de Biasi, Emilio. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comision Nacional de Energia Atomica. Gerencia del Area de Investigaciones y Aplicaciones no Nucleares. Gerencia de Fisica (CAB); Argentina
Fil: Lima Jr., Enio. Comision Nacional de Energia Atomica. Gerencia del Area de Investigaciones y Aplicaciones no Nucleares. Gerencia de Fisica (CAB); Argentina
Fil: Ramos, Carlos A.. Comision Nacional de Energia Atomica. Gerencia del Area de Investigaciones y Aplicaciones no Nucleares. Gerencia de Fisica (CAB); Argentina
Fil: Butera, Alejandro Ricardo. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comision Nacional de Energia Atomica. Gerencia del Area de Investigaciones y Aplicaciones no Nucleares. Gerencia de Fisica (CAB); Argentina
Fil: Zysler, Roberto Daniel. Comision Nacional de Energia Atomica. Gerencia del Area de Investigaciones y Aplicaciones no Nucleares. Gerencia de Fisica (CAB); Argentina - Materia
-
Ferromagnetic Resonance
Thermal Fluctuations
Bloking
Superparamagnetism - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
- Repositorio
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/11062
Ver los metadatos del registro completo
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Effect of Thermal Fluctuations in FMR Experiments in Uniaxial Magnetic Nanoparticles: Blocked vs. Superparamagnetic Regimesde Biasi, EmilioLima Jr., EnioRamos, Carlos A.Butera, Alejandro RicardoZysler, Roberto DanielFerromagnetic ResonanceThermal FluctuationsBlokingSuperparamagnetismhttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1We present ferromagnetic resonance (FMR) experiments on two low-interacting nanoparticle systems: Fe3O4 and CoFe2O4 corresponding to low- and high-anisotropy cases, respectively. The spectra have been interpreted in terms of a phenomenological model which applies to the FMR of nanoparticles. The model includes the effect of thermal fluctuations in the FMR covering the range from the superparamagnetic (low-anisotropy-high-temperature) regime to the high-anisotropy-low-temperature situation. We have been able to explain several simultaneous features observed in the FMR spectra of a system of anisotropic nanoparticles when lowering the temperature that include: a decrease of the resonance field with a simultaneous linewidth increase and intensity reduction. These effects had been previously attributed to the existence of a ‘‘blocking-temperature’’ in the FMR. Our interpretation, however, shows that in a magnetic system with easy axes this FMR response originates in the temperature dependence of the dispersion relation. Also, applying the present model to the FMR within the hysteresis cycle it is possible to reproduce the irreversibilities occurring in the resonance spectra. Comparison of FMR and magnetization measurements show that the characteristic FMR time is not related to the inverse microwave frequency.Fil: de Biasi, Emilio. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comision Nacional de Energia Atomica. Gerencia del Area de Investigaciones y Aplicaciones no Nucleares. Gerencia de Fisica (CAB); ArgentinaFil: Lima Jr., Enio. Comision Nacional de Energia Atomica. Gerencia del Area de Investigaciones y Aplicaciones no Nucleares. Gerencia de Fisica (CAB); ArgentinaFil: Ramos, Carlos A.. Comision Nacional de Energia Atomica. Gerencia del Area de Investigaciones y Aplicaciones no Nucleares. Gerencia de Fisica (CAB); ArgentinaFil: Butera, Alejandro Ricardo. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comision Nacional de Energia Atomica. Gerencia del Area de Investigaciones y Aplicaciones no Nucleares. Gerencia de Fisica (CAB); ArgentinaFil: Zysler, Roberto Daniel. Comision Nacional de Energia Atomica. Gerencia del Area de Investigaciones y Aplicaciones no Nucleares. Gerencia de Fisica (CAB); ArgentinaElsevier Science2013-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/11062de Biasi, Emilio; Lima Jr., Enio; Ramos, Carlos A.; Butera, Alejandro Ricardo; Zysler, Roberto Daniel; Effect of Thermal Fluctuations in FMR Experiments in Uniaxial Magnetic Nanoparticles: Blocked vs. Superparamagnetic Regimes; Elsevier Science; Journal Of Magnetism And Magnetic Materials; 326; 1-2013; 138-1460304-8853enginfo:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S0304885312007342info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jmmm.2012.08.046info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-nd/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:00:50Zoai:ri.conicet.gov.ar:11336/11062instacron: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:34982025-09-29 10:00:50.678CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse |
dc.title.none.fl_str_mv |
Effect of Thermal Fluctuations in FMR Experiments in Uniaxial Magnetic Nanoparticles: Blocked vs. Superparamagnetic Regimes |
title |
Effect of Thermal Fluctuations in FMR Experiments in Uniaxial Magnetic Nanoparticles: Blocked vs. Superparamagnetic Regimes |
spellingShingle |
Effect of Thermal Fluctuations in FMR Experiments in Uniaxial Magnetic Nanoparticles: Blocked vs. Superparamagnetic Regimes de Biasi, Emilio Ferromagnetic Resonance Thermal Fluctuations Bloking Superparamagnetism |
title_short |
Effect of Thermal Fluctuations in FMR Experiments in Uniaxial Magnetic Nanoparticles: Blocked vs. Superparamagnetic Regimes |
title_full |
Effect of Thermal Fluctuations in FMR Experiments in Uniaxial Magnetic Nanoparticles: Blocked vs. Superparamagnetic Regimes |
title_fullStr |
Effect of Thermal Fluctuations in FMR Experiments in Uniaxial Magnetic Nanoparticles: Blocked vs. Superparamagnetic Regimes |
title_full_unstemmed |
Effect of Thermal Fluctuations in FMR Experiments in Uniaxial Magnetic Nanoparticles: Blocked vs. Superparamagnetic Regimes |
title_sort |
Effect of Thermal Fluctuations in FMR Experiments in Uniaxial Magnetic Nanoparticles: Blocked vs. Superparamagnetic Regimes |
dc.creator.none.fl_str_mv |
de Biasi, Emilio Lima Jr., Enio Ramos, Carlos A. Butera, Alejandro Ricardo Zysler, Roberto Daniel |
author |
de Biasi, Emilio |
author_facet |
de Biasi, Emilio Lima Jr., Enio Ramos, Carlos A. Butera, Alejandro Ricardo Zysler, Roberto Daniel |
author_role |
author |
author2 |
Lima Jr., Enio Ramos, Carlos A. Butera, Alejandro Ricardo Zysler, Roberto Daniel |
author2_role |
author author author author |
dc.subject.none.fl_str_mv |
Ferromagnetic Resonance Thermal Fluctuations Bloking Superparamagnetism |
topic |
Ferromagnetic Resonance Thermal Fluctuations Bloking Superparamagnetism |
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 present ferromagnetic resonance (FMR) experiments on two low-interacting nanoparticle systems: Fe3O4 and CoFe2O4 corresponding to low- and high-anisotropy cases, respectively. The spectra have been interpreted in terms of a phenomenological model which applies to the FMR of nanoparticles. The model includes the effect of thermal fluctuations in the FMR covering the range from the superparamagnetic (low-anisotropy-high-temperature) regime to the high-anisotropy-low-temperature situation. We have been able to explain several simultaneous features observed in the FMR spectra of a system of anisotropic nanoparticles when lowering the temperature that include: a decrease of the resonance field with a simultaneous linewidth increase and intensity reduction. These effects had been previously attributed to the existence of a ‘‘blocking-temperature’’ in the FMR. Our interpretation, however, shows that in a magnetic system with easy axes this FMR response originates in the temperature dependence of the dispersion relation. Also, applying the present model to the FMR within the hysteresis cycle it is possible to reproduce the irreversibilities occurring in the resonance spectra. Comparison of FMR and magnetization measurements show that the characteristic FMR time is not related to the inverse microwave frequency. Fil: de Biasi, Emilio. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comision Nacional de Energia Atomica. Gerencia del Area de Investigaciones y Aplicaciones no Nucleares. Gerencia de Fisica (CAB); Argentina Fil: Lima Jr., Enio. Comision Nacional de Energia Atomica. Gerencia del Area de Investigaciones y Aplicaciones no Nucleares. Gerencia de Fisica (CAB); Argentina Fil: Ramos, Carlos A.. Comision Nacional de Energia Atomica. Gerencia del Area de Investigaciones y Aplicaciones no Nucleares. Gerencia de Fisica (CAB); Argentina Fil: Butera, Alejandro Ricardo. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comision Nacional de Energia Atomica. Gerencia del Area de Investigaciones y Aplicaciones no Nucleares. Gerencia de Fisica (CAB); Argentina Fil: Zysler, Roberto Daniel. Comision Nacional de Energia Atomica. Gerencia del Area de Investigaciones y Aplicaciones no Nucleares. Gerencia de Fisica (CAB); Argentina |
description |
We present ferromagnetic resonance (FMR) experiments on two low-interacting nanoparticle systems: Fe3O4 and CoFe2O4 corresponding to low- and high-anisotropy cases, respectively. The spectra have been interpreted in terms of a phenomenological model which applies to the FMR of nanoparticles. The model includes the effect of thermal fluctuations in the FMR covering the range from the superparamagnetic (low-anisotropy-high-temperature) regime to the high-anisotropy-low-temperature situation. We have been able to explain several simultaneous features observed in the FMR spectra of a system of anisotropic nanoparticles when lowering the temperature that include: a decrease of the resonance field with a simultaneous linewidth increase and intensity reduction. These effects had been previously attributed to the existence of a ‘‘blocking-temperature’’ in the FMR. Our interpretation, however, shows that in a magnetic system with easy axes this FMR response originates in the temperature dependence of the dispersion relation. Also, applying the present model to the FMR within the hysteresis cycle it is possible to reproduce the irreversibilities occurring in the resonance spectra. Comparison of FMR and magnetization measurements show that the characteristic FMR time is not related to the inverse microwave frequency. |
publishDate |
2013 |
dc.date.none.fl_str_mv |
2013-01 |
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/11336/11062 de Biasi, Emilio; Lima Jr., Enio; Ramos, Carlos A.; Butera, Alejandro Ricardo; Zysler, Roberto Daniel; Effect of Thermal Fluctuations in FMR Experiments in Uniaxial Magnetic Nanoparticles: Blocked vs. Superparamagnetic Regimes; Elsevier Science; Journal Of Magnetism And Magnetic Materials; 326; 1-2013; 138-146 0304-8853 |
url |
http://hdl.handle.net/11336/11062 |
identifier_str_mv |
de Biasi, Emilio; Lima Jr., Enio; Ramos, Carlos A.; Butera, Alejandro Ricardo; Zysler, Roberto Daniel; Effect of Thermal Fluctuations in FMR Experiments in Uniaxial Magnetic Nanoparticles: Blocked vs. Superparamagnetic Regimes; Elsevier Science; Journal Of Magnetism And Magnetic Materials; 326; 1-2013; 138-146 0304-8853 |
dc.language.none.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
info:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S0304885312007342 info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jmmm.2012.08.046 |
dc.rights.none.fl_str_mv |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-nd/2.5/ar/ |
eu_rights_str_mv |
openAccess |
rights_invalid_str_mv |
https://creativecommons.org/licenses/by-nc-nd/2.5/ar/ |
dc.format.none.fl_str_mv |
application/pdf application/pdf |
dc.publisher.none.fl_str_mv |
Elsevier Science |
publisher.none.fl_str_mv |
Elsevier Science |
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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1844613794559426560 |
score |
13.070432 |