Structural and magnetic properties of high magnetization FexCo100-x nanoparticles investigated at the nanoscale: Unveiling the origin of the observed anisotropy

In this work the authors have performed the synthesis of FexCo100-x (0<x<100) alloy nanoparticles (NPs) with different compositions, as well as pure Fe and Co NPs for comparison, by a chemical reduction technique. The subsequent characterization demonstrated excellent quality NPs with the expe...

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Autores: Gutiérrez Etxebarria, Jon, Vadillo Lacasa, Virginia, Puente Orench, Inés, Mondelli, Claudia, Capron, Marie, Alonso Masa, Javier, Orue Goikuria, Iñaki, Lazpita Arizmendiarrieta, Patricia, Saiz Garitaonandia, José Javier, Gil de Muro Zabala, Izaskun, Baroni, Tommaso, D'Acapito, Francesco, Insausti Peña, María Teresa
Tipo de recurso: artículo
Fecha de publicación:2024
País:España
Institución:Universidad del País Vasco
Repositorio:Addi. Archivo Digital para la Docencia y la Investigación
OAI Identifier:oai:addi.ehu.eus:10810/70827
Acceso en línea:http://hdl.handle.net/10810/70827
Access Level:acceso abierto
Palabra clave:iron cobalt alloy
magnetic nanoparticles
magnetic anisotropy
neutron diffraction
EXAFS and XANES spectroscopies
Mössbauer spectroscopy
shape anisotropy
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spelling Structural and magnetic properties of high magnetization FexCo100-x nanoparticles investigated at the nanoscale: Unveiling the origin of the observed anisotropyGutiérrez Etxebarria, JonVadillo Lacasa, VirginiaPuente Orench, InésMondelli, ClaudiaCapron, MarieAlonso Masa, JavierOrue Goikuria, IñakiLazpita Arizmendiarrieta, PatriciaSaiz Garitaonandia, José JavierGil de Muro Zabala, IzaskunBaroni, TommasoD'Acapito, FrancescoInsausti Peña, María Teresairon cobalt alloymagnetic nanoparticlesmagnetic anisotropyneutron diffractionEXAFS and XANES spectroscopiesMössbauer spectroscopyshape anisotropyIn this work the authors have performed the synthesis of FexCo100-x (0<x<100) alloy nanoparticles (NPs) with different compositions, as well as pure Fe and Co NPs for comparison, by a chemical reduction technique. The subsequent characterization demonstrated excellent quality NPs with the expected bcc cubic (for Fe and FeCo alloys) and hcp hexagonal (for Co NPs) structures showing a room temperature magnetization as high as 235 emu/g for the Fe66Co34 composition alloy. Nevertheless, this soft magnetic character is accompanied by determined values of effective anisotropy as high as 2 MJ/m3. Aiming to deep into the properties of these FeCo alloys as well as to unveil the origin of that observed high anisotropy value, we now present an extensive study at the nanoscale of the synthesized Fe, Co and FexCo100-x alloy nanoparticles by using nuclear techniques as neutron powder diffraction, EXAFS and XANES spectroscopies. Mössbauer spectroscopy revealed that the FeCo alloys are in an A2 disordered solid solution. The obtained results, combined with AFM/MFM images, have demonstrated that despite the cubic bcc structure observed for all FeCo alloys (in excellent concordance with the pure Fe one) the NPs show a "flaky" shape of 50–60 nm size (diameter) but only 3–4 nm thickness, giving rise to a strong shape anisotropy contribution to the observed total effective anisotropy.J. Gutiérrez and M. Insausti gratefully acknowledge the financial support of the Basque Government under Research Groups Programme (IT1479-22 and IT1546-22, respectively) projects and research project MMASINT (KK-2023/00041, Elkartek Program). J. Gutiérrez, J. Alonso and M. Insausti also want to acknowledge grants No. PID2022–138108OB-C33, PID2020–115704RB-C3 and PID2022–136993OB-I00, respectively, funded by MCIN/AEI/ 10.13039/501100011033 and, as appropriate, by “ERDF A way of making Europe”, by the “European Union” or by the “European Union NextGenerationEU/PRTR”. The Authors acknowledge the Spanish Ministry of Science Innovation and Universities as well as SpINS for the beam time allocation at D1B instrument at ILL (Grenoble, France), and the financial support of CERIC for the experiment at the LISA beamline (codes 08011082 and 20212115). Technical and human support provided by the General Research Services of the UPV/EHU (SGIker) is gratefully acknowledged.Elsevier202420242025info:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10810/70827reponame:Addi. Archivo Digital para la Docencia y la Investigacióninstname:Universidad del País VascoInglésinfo:eu-repo/grantAgreement/MICINN/PID2022–138108OB-C33/info:eu-repo/grantAgreement/MICINN/PID2020–115704RB-C3/info:eu-repo/grantAgreement/MICINN/PID2022–136993OB-I00/https://www.sciencedirect.com/science/article/pii/S092583882403799Xinfo:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-nd/3.0/es/© 2024 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license.Atribución-NoComercial-SinDerivadas 3.0 Españaoai:addi.ehu.eus:10810/708272026-06-18T09:23:17Z
dc.title.none.fl_str_mv Structural and magnetic properties of high magnetization FexCo100-x nanoparticles investigated at the nanoscale: Unveiling the origin of the observed anisotropy
title Structural and magnetic properties of high magnetization FexCo100-x nanoparticles investigated at the nanoscale: Unveiling the origin of the observed anisotropy
spellingShingle Structural and magnetic properties of high magnetization FexCo100-x nanoparticles investigated at the nanoscale: Unveiling the origin of the observed anisotropy
Gutiérrez Etxebarria, Jon
iron cobalt alloy
magnetic nanoparticles
magnetic anisotropy
neutron diffraction
EXAFS and XANES spectroscopies
Mössbauer spectroscopy
shape anisotropy
title_short Structural and magnetic properties of high magnetization FexCo100-x nanoparticles investigated at the nanoscale: Unveiling the origin of the observed anisotropy
title_full Structural and magnetic properties of high magnetization FexCo100-x nanoparticles investigated at the nanoscale: Unveiling the origin of the observed anisotropy
title_fullStr Structural and magnetic properties of high magnetization FexCo100-x nanoparticles investigated at the nanoscale: Unveiling the origin of the observed anisotropy
title_full_unstemmed Structural and magnetic properties of high magnetization FexCo100-x nanoparticles investigated at the nanoscale: Unveiling the origin of the observed anisotropy
title_sort Structural and magnetic properties of high magnetization FexCo100-x nanoparticles investigated at the nanoscale: Unveiling the origin of the observed anisotropy
dc.creator.none.fl_str_mv Gutiérrez Etxebarria, Jon
Vadillo Lacasa, Virginia
Puente Orench, Inés
Mondelli, Claudia
Capron, Marie
Alonso Masa, Javier
Orue Goikuria, Iñaki
Lazpita Arizmendiarrieta, Patricia
Saiz Garitaonandia, José Javier
Gil de Muro Zabala, Izaskun
Baroni, Tommaso
D'Acapito, Francesco
Insausti Peña, María Teresa
author Gutiérrez Etxebarria, Jon
author_facet Gutiérrez Etxebarria, Jon
Vadillo Lacasa, Virginia
Puente Orench, Inés
Mondelli, Claudia
Capron, Marie
Alonso Masa, Javier
Orue Goikuria, Iñaki
Lazpita Arizmendiarrieta, Patricia
Saiz Garitaonandia, José Javier
Gil de Muro Zabala, Izaskun
Baroni, Tommaso
D'Acapito, Francesco
Insausti Peña, María Teresa
author_role author
author2 Vadillo Lacasa, Virginia
Puente Orench, Inés
Mondelli, Claudia
Capron, Marie
Alonso Masa, Javier
Orue Goikuria, Iñaki
Lazpita Arizmendiarrieta, Patricia
Saiz Garitaonandia, José Javier
Gil de Muro Zabala, Izaskun
Baroni, Tommaso
D'Acapito, Francesco
Insausti Peña, María Teresa
author2_role author
author
author
author
author
author
author
author
author
author
author
author
dc.subject.none.fl_str_mv iron cobalt alloy
magnetic nanoparticles
magnetic anisotropy
neutron diffraction
EXAFS and XANES spectroscopies
Mössbauer spectroscopy
shape anisotropy
topic iron cobalt alloy
magnetic nanoparticles
magnetic anisotropy
neutron diffraction
EXAFS and XANES spectroscopies
Mössbauer spectroscopy
shape anisotropy
description In this work the authors have performed the synthesis of FexCo100-x (0<x<100) alloy nanoparticles (NPs) with different compositions, as well as pure Fe and Co NPs for comparison, by a chemical reduction technique. The subsequent characterization demonstrated excellent quality NPs with the expected bcc cubic (for Fe and FeCo alloys) and hcp hexagonal (for Co NPs) structures showing a room temperature magnetization as high as 235 emu/g for the Fe66Co34 composition alloy. Nevertheless, this soft magnetic character is accompanied by determined values of effective anisotropy as high as 2 MJ/m3. Aiming to deep into the properties of these FeCo alloys as well as to unveil the origin of that observed high anisotropy value, we now present an extensive study at the nanoscale of the synthesized Fe, Co and FexCo100-x alloy nanoparticles by using nuclear techniques as neutron powder diffraction, EXAFS and XANES spectroscopies. Mössbauer spectroscopy revealed that the FeCo alloys are in an A2 disordered solid solution. The obtained results, combined with AFM/MFM images, have demonstrated that despite the cubic bcc structure observed for all FeCo alloys (in excellent concordance with the pure Fe one) the NPs show a "flaky" shape of 50–60 nm size (diameter) but only 3–4 nm thickness, giving rise to a strong shape anisotropy contribution to the observed total effective anisotropy.
publishDate 2024
dc.date.none.fl_str_mv 2024
2024
2025
dc.type.none.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10810/70827
url http://hdl.handle.net/10810/70827
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv info:eu-repo/grantAgreement/MICINN/PID2022–138108OB-C33/
info:eu-repo/grantAgreement/MICINN/PID2020–115704RB-C3/
info:eu-repo/grantAgreement/MICINN/PID2022–136993OB-I00/
https://www.sciencedirect.com/science/article/pii/S092583882403799X
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/3.0/es/
Atribución-NoComercial-SinDerivadas 3.0 España
eu_rights_str_mv openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by-nc-nd/3.0/es/
Atribución-NoComercial-SinDerivadas 3.0 España
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:Addi. Archivo Digital para la Docencia y la Investigación
instname:Universidad del País Vasco
instname_str Universidad del País Vasco
reponame_str Addi. Archivo Digital para la Docencia y la Investigación
collection Addi. Archivo Digital para la Docencia y la Investigación
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,81155

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