Hardening of Cobalt Ferrite Nanoparticles by Local Crystal Strain Release: Implications for Rare Earth Free Magnets

[EN] In this work, we demonstrate that the reduction of the local internal stress by a low-temperature solvent-mediated thermal treatment is an effective post-treatment tool for magnetic hardening of chemically synthesized nanoparticles. As a case study, we used nonstoichiometric cobalt ferrite part...

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Autores: Muzzi, Beatrice, Lottini, Elisabetta, Yaacoub, Nader, Peddis, Davide, Bertoni, Giovanni, Julián Fernández, César de, Sangregorio, Claudio, López-Ortega, Alberto, AMPHIBIAN Project ID:720853
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2022
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/335919
Acceso en línea:http://hdl.handle.net/10261/335919
Access Level:acceso abierto
Palabra clave:Cobalt ferrite
Magnetic nanoparticles
Microstrain
Geometrical phase analysis
Solvent-mediate dannealing
Coercivity
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spelling Hardening of Cobalt Ferrite Nanoparticles by Local Crystal Strain Release: Implications for Rare Earth Free MagnetsMuzzi, BeatriceLottini, ElisabettaYaacoub, NaderPeddis, DavideBertoni, GiovanniJulián Fernández, César deSangregorio, ClaudioLópez-Ortega, AlbertoAMPHIBIAN Project ID:720853Cobalt ferriteMagnetic nanoparticlesMicrostrainGeometrical phase analysisSolvent-mediate dannealingCoercivity[EN] In this work, we demonstrate that the reduction of the local internal stress by a low-temperature solvent-mediated thermal treatment is an effective post-treatment tool for magnetic hardening of chemically synthesized nanoparticles. As a case study, we used nonstoichiometric cobalt ferrite particles of an average size of 32(8) nm synthesized by thermal decomposition, which were further subjected to solvent-mediated annealing at variable temperatures between 150 and 320 °C in an inert atmosphere. The postsynthesis treatment produces a 50% increase of the coercive field, without affecting neither the remanence ratio nor the spontaneous magnetization. As a consequence, the energy product and the magnetic energy storage capability, key features for applications as permanent magnets and magnetic hyperthermia, can be increased by ca. 70%. A deep structural, morphological, chemical, and magnetic characterization reveals that the mechanism governing the coercive field improvement is the reduction of the concomitant internal stresses induced by the low-temperature annealing postsynthesis treatment. Furthermore, we show that the medium where the mild annealing process occurs is essential to control the final properties of the nanoparticles because the classical annealing procedure (T > 350 °C) performed on a dried powder does not allow the release of the lattice stress, leading to the reduction of the initial coercive field. The strategy here proposed, therefore, constitutes a method to improve the magnetic properties of nanoparticles, which can be particularly appealing for those materials, as is the case of cobalt ferrite, currently investigated as building blocks for the development of rare-earth free permanent magnets.Open access funding provided by Universidad Pública de Navarra. This work was supported by EU-H2020 AMPHIBIAN Project (Grant no. 720853). A.L.O. acknowledges support from the Universidad Pública de Navarra (Grant no. PJUPNA2020).Peer reviewedACS PublicationsUniversidad Pública de Navarra202320232022info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/335919reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/EC/H2020/720853https://doi.org/10.1021/acsanm.2c03161Noinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/3359192026-05-22T06:33:51Z
dc.title.none.fl_str_mv Hardening of Cobalt Ferrite Nanoparticles by Local Crystal Strain Release: Implications for Rare Earth Free Magnets
title Hardening of Cobalt Ferrite Nanoparticles by Local Crystal Strain Release: Implications for Rare Earth Free Magnets
spellingShingle Hardening of Cobalt Ferrite Nanoparticles by Local Crystal Strain Release: Implications for Rare Earth Free Magnets
Muzzi, Beatrice
Cobalt ferrite
Magnetic nanoparticles
Microstrain
Geometrical phase analysis
Solvent-mediate dannealing
Coercivity
title_short Hardening of Cobalt Ferrite Nanoparticles by Local Crystal Strain Release: Implications for Rare Earth Free Magnets
title_full Hardening of Cobalt Ferrite Nanoparticles by Local Crystal Strain Release: Implications for Rare Earth Free Magnets
title_fullStr Hardening of Cobalt Ferrite Nanoparticles by Local Crystal Strain Release: Implications for Rare Earth Free Magnets
title_full_unstemmed Hardening of Cobalt Ferrite Nanoparticles by Local Crystal Strain Release: Implications for Rare Earth Free Magnets
title_sort Hardening of Cobalt Ferrite Nanoparticles by Local Crystal Strain Release: Implications for Rare Earth Free Magnets
dc.creator.none.fl_str_mv Muzzi, Beatrice
Lottini, Elisabetta
Yaacoub, Nader
Peddis, Davide
Bertoni, Giovanni
Julián Fernández, César de
Sangregorio, Claudio
López-Ortega, Alberto
AMPHIBIAN Project ID:720853
author Muzzi, Beatrice
author_facet Muzzi, Beatrice
Lottini, Elisabetta
Yaacoub, Nader
Peddis, Davide
Bertoni, Giovanni
Julián Fernández, César de
Sangregorio, Claudio
López-Ortega, Alberto
AMPHIBIAN Project ID:720853
author_role author
author2 Lottini, Elisabetta
Yaacoub, Nader
Peddis, Davide
Bertoni, Giovanni
Julián Fernández, César de
Sangregorio, Claudio
López-Ortega, Alberto
AMPHIBIAN Project ID:720853
author2_role author
author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv Universidad Pública de Navarra
dc.subject.none.fl_str_mv Cobalt ferrite
Magnetic nanoparticles
Microstrain
Geometrical phase analysis
Solvent-mediate dannealing
Coercivity
topic Cobalt ferrite
Magnetic nanoparticles
Microstrain
Geometrical phase analysis
Solvent-mediate dannealing
Coercivity
description [EN] In this work, we demonstrate that the reduction of the local internal stress by a low-temperature solvent-mediated thermal treatment is an effective post-treatment tool for magnetic hardening of chemically synthesized nanoparticles. As a case study, we used nonstoichiometric cobalt ferrite particles of an average size of 32(8) nm synthesized by thermal decomposition, which were further subjected to solvent-mediated annealing at variable temperatures between 150 and 320 °C in an inert atmosphere. The postsynthesis treatment produces a 50% increase of the coercive field, without affecting neither the remanence ratio nor the spontaneous magnetization. As a consequence, the energy product and the magnetic energy storage capability, key features for applications as permanent magnets and magnetic hyperthermia, can be increased by ca. 70%. A deep structural, morphological, chemical, and magnetic characterization reveals that the mechanism governing the coercive field improvement is the reduction of the concomitant internal stresses induced by the low-temperature annealing postsynthesis treatment. Furthermore, we show that the medium where the mild annealing process occurs is essential to control the final properties of the nanoparticles because the classical annealing procedure (T > 350 °C) performed on a dried powder does not allow the release of the lattice stress, leading to the reduction of the initial coercive field. The strategy here proposed, therefore, constitutes a method to improve the magnetic properties of nanoparticles, which can be particularly appealing for those materials, as is the case of cobalt ferrite, currently investigated as building blocks for the development of rare-earth free permanent magnets.
publishDate 2022
dc.date.none.fl_str_mv 2022
2023
2023
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/335919
url http://hdl.handle.net/10261/335919
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv #PLACEHOLDER_PARENT_METADATA_VALUE#
info:eu-repo/grantAgreement/EC/H2020/720853
https://doi.org/10.1021/acsanm.2c03161
No
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv ACS Publications
publisher.none.fl_str_mv ACS Publications
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15.812429

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