Transition from AFM spin canting to spin glass-AFM exchange as particle size decreases in LaFeO_3

In this work, we have studied structural and magnetic properties of LaFeO_3 as a function of the particle size d, from bulk (d >> 1 µm) to nanoscale (d ≈ 30 nm). A large number of twins were observed for large particles that disappear for small particle sizes. This could be related to the soft...

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Autores: Alshalawi, Dhoha, Alonso, Jose Maria, Landa-Canovas, Angel R., Presa Muñoz De Toro, Patricia Marcela De La
Tipo de recurso: artículo
Fecha de publicación:2023
País:España
Institución:Universidad Complutense de Madrid (UCM)
Repositorio:Docta Complutense
Idioma:inglés
OAI Identifier:oai:docta.ucm.es:20.500.14352/87342
Acceso en línea:https://hdl.handle.net/20.500.14352/87342
Access Level:acceso abierto
Palabra clave:538.9
Perovskite oxides
Exchange bias
Nanoparticles
Nanostructure
Física de materiales
2211 Física del Estado Sólido
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spelling Transition from AFM spin canting to spin glass-AFM exchange as particle size decreases in LaFeO_3Alshalawi, DhohaAlonso, Jose MariaLanda-Canovas, Angel R.Presa Muñoz De Toro, Patricia Marcela De La538.9Perovskite oxidesExchange biasNanoparticlesNanostructureFísica de materiales2211 Física del Estado SólidoIn this work, we have studied structural and magnetic properties of LaFeO_3 as a function of the particle size d, from bulk (d >> 1 µm) to nanoscale (d ≈ 30 nm). A large number of twins were observed for large particles that disappear for small particle sizes. This could be related to the softening of the FeO_6 distortion as particle size decreases. It was observed that the bulk sample showed spin canting that disappeared for d ~ 125 nm and can be associated with the smoothening of the orthorhombic distortion. On the other hand, for d < 60 nm, the surface/volume ratio became high and, despite the high crystallinity of the nanoparticle, a notable exchange effect bias appeared, originated by two magnetic interactions: spin glass and antiferromagnetism. This exchange bias interaction was originated by the formation of a "magnetic core-shell": the broken bonds at the surface atoms give place to a spin glass behavior, whereas the inner atoms maintain the antiferromagnetic G-type order. The LaFeO_3 bulk material was synthesized by the ceramic method, whereas the LaFeO_3 nanoparticles were synthesized by the sol-gel method; the particle size was varied by annealing the samples at different temperatures. The physical properties of the materials have been investigated by XRD, HRTEM, TGA, and AC and DC magnetometry.MDPIUniversidad Complutense de Madrid20232023-05-1720232023-05-17journal articlehttp://purl.org/coar/resource_type/c_6501VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/20.500.14352/87342reponame:Docta Complutenseinstname:Universidad Complutense de Madrid (UCM)InglésengMinisterio de Ciencia e Innovación http://dx.doi.org/10.13039/501100004837 Not available Not availableNot available Not available Not availableopen accesshttp://purl.org/coar/access_right/c_abf2Attribution 4.0 Internationalhttp://creativecommons.org/licenses/by/4.0/info:eu-repo/semantics/openAccessoai:docta.ucm.es:20.500.14352/873422026-06-02T12:44:21Z
dc.title.none.fl_str_mv Transition from AFM spin canting to spin glass-AFM exchange as particle size decreases in LaFeO_3
title Transition from AFM spin canting to spin glass-AFM exchange as particle size decreases in LaFeO_3
spellingShingle Transition from AFM spin canting to spin glass-AFM exchange as particle size decreases in LaFeO_3
Alshalawi, Dhoha
538.9
Perovskite oxides
Exchange bias
Nanoparticles
Nanostructure
Física de materiales
2211 Física del Estado Sólido
title_short Transition from AFM spin canting to spin glass-AFM exchange as particle size decreases in LaFeO_3
title_full Transition from AFM spin canting to spin glass-AFM exchange as particle size decreases in LaFeO_3
title_fullStr Transition from AFM spin canting to spin glass-AFM exchange as particle size decreases in LaFeO_3
title_full_unstemmed Transition from AFM spin canting to spin glass-AFM exchange as particle size decreases in LaFeO_3
title_sort Transition from AFM spin canting to spin glass-AFM exchange as particle size decreases in LaFeO_3
dc.creator.none.fl_str_mv Alshalawi, Dhoha
Alonso, Jose Maria
Landa-Canovas, Angel R.
Presa Muñoz De Toro, Patricia Marcela De La
author Alshalawi, Dhoha
author_facet Alshalawi, Dhoha
Alonso, Jose Maria
Landa-Canovas, Angel R.
Presa Muñoz De Toro, Patricia Marcela De La
author_role author
author2 Alonso, Jose Maria
Landa-Canovas, Angel R.
Presa Muñoz De Toro, Patricia Marcela De La
author2_role author
author
author
dc.contributor.none.fl_str_mv Universidad Complutense de Madrid
dc.subject.none.fl_str_mv 538.9
Perovskite oxides
Exchange bias
Nanoparticles
Nanostructure
Física de materiales
2211 Física del Estado Sólido
topic 538.9
Perovskite oxides
Exchange bias
Nanoparticles
Nanostructure
Física de materiales
2211 Física del Estado Sólido
description In this work, we have studied structural and magnetic properties of LaFeO_3 as a function of the particle size d, from bulk (d >> 1 µm) to nanoscale (d ≈ 30 nm). A large number of twins were observed for large particles that disappear for small particle sizes. This could be related to the softening of the FeO_6 distortion as particle size decreases. It was observed that the bulk sample showed spin canting that disappeared for d ~ 125 nm and can be associated with the smoothening of the orthorhombic distortion. On the other hand, for d < 60 nm, the surface/volume ratio became high and, despite the high crystallinity of the nanoparticle, a notable exchange effect bias appeared, originated by two magnetic interactions: spin glass and antiferromagnetism. This exchange bias interaction was originated by the formation of a "magnetic core-shell": the broken bonds at the surface atoms give place to a spin glass behavior, whereas the inner atoms maintain the antiferromagnetic G-type order. The LaFeO_3 bulk material was synthesized by the ceramic method, whereas the LaFeO_3 nanoparticles were synthesized by the sol-gel method; the particle size was varied by annealing the samples at different temperatures. The physical properties of the materials have been investigated by XRD, HRTEM, TGA, and AC and DC magnetometry.
publishDate 2023
dc.date.none.fl_str_mv 2023
2023-05-17
2023
2023-05-17
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
VoR
http://purl.org/coar/version/c_970fb48d4fbd8a85
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/20.500.14352/87342
url https://hdl.handle.net/20.500.14352/87342
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.relation.none.fl_str_mv Ministerio de Ciencia e Innovación http://dx.doi.org/10.13039/501100004837 Not available Not available
Not available Not available Not available
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution 4.0 International
http://creativecommons.org/licenses/by/4.0/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution 4.0 International
http://creativecommons.org/licenses/by/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv MDPI
publisher.none.fl_str_mv MDPI
dc.source.none.fl_str_mv reponame:Docta Complutense
instname:Universidad Complutense de Madrid (UCM)
instname_str Universidad Complutense de Madrid (UCM)
reponame_str Docta Complutense
collection Docta Complutense
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,300719

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