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 expected b...
| Authors: | ; ; ; ; ; ; ; ; ; ; ; ; |
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| Format: | Article |
| Publication date: | 2024 |
| Country: | España |
| Institution: | Universidad del País Vasco |
| Repository: | Addi. Archivo Digital para la Docencia y la Investigación |
| OAI Identifier: | oai:addi.ehu.eus:10810/70827 |
| Online Access: | http://hdl.handle.net/10810/70827 |
| Access Level: | Open access |
| Keyword: | iron cobalt alloy magnetic nanoparticles magnetic anisotropy neutron diffraction EXAFS and XANES spectroscopies Mössbauer spectroscopy shape anisotropy |
| _version_ | 1878732939831803904 |
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| author | Gutiérrez Etxebarria, Jon |
| 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 |
| author_browse | Alonso Masa, Javier Baroni, Tommaso Capron, Marie D'Acapito, Francesco Gil de Muro Zabala, Izaskun Gutiérrez Etxebarria, Jon Insausti Peña, María Teresa Lazpita Arizmendiarrieta, Patricia Mondelli, Claudia Orue Goikuria, Iñaki Puente Orench, Inés Saiz Garitaonandia, José Javier Vadillo Lacasa, Virginia |
| 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 |
| collection | Addi. Archivo Digital para la Docencia y la Investigación |
| 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. |
| eu_rights_str_mv | openAccess |
| format | article |
| id | ES_4cdcdfd9fbf4deda10d5becba7e93db2 |
| institution | Universidad del País Vasco |
| instname_str | Universidad del País Vasco |
| network_acronym_str | ES |
| network_name_str | España |
| oai_identifier_str | oai:addi.ehu.eus:10810/70827 |
| publishDate | 2024 |
| publishDateSort | 2024 |
| publisher | Elsevier |
| publisherStr | Elsevier |
| reponame_str | Addi. Archivo Digital para la Docencia y la Investigación |
| spelling | Structural and magnetic properties of high magnetization FexCo100-x nanoparticles investigated at the nanoscale: Unveiling the origin of the observed anisotropy 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 iron cobalt alloy magnetic nanoparticles magnetic anisotropy neutron diffraction EXAFS and XANES spectroscopies Mössbauer spectroscopy shape 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 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. Elsevier http://hdl.handle.net/10810/70827 |
| 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 | 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_short | 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 |
| topic | iron cobalt alloy magnetic nanoparticles magnetic anisotropy neutron diffraction EXAFS and XANES spectroscopies Mössbauer spectroscopy shape anisotropy |
| topic_facet | iron cobalt alloy magnetic nanoparticles magnetic anisotropy neutron diffraction EXAFS and XANES spectroscopies Mössbauer spectroscopy shape anisotropy |
| url | http://hdl.handle.net/10810/70827 |