Magnetic order and disorder environments in superantiferromagnetic NdCu2 nanoparticles

Magnetic nanoparticles exhibit two different local symmetry environments, one ascribed to the core and one corresponding to the nanoparticle surface. This implies the existence of a dual spin dynamics, leading to the presence of two different magnetic arrangements governed by different correlation l...

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Autores: Martín Jefremovas, Elizabeth|||0000-0001-8501-058X, Svedlindh, P., Damay, F., Alba Venero, Diego, Michels, A., Blanco, J. A., Fernández Barquín, Luis|||0000-0003-4722-3722
Tipo de recurso: artículo
Fecha de publicación:2022
País:España
Institución:Universidad de Cantabria (UC)
Repositorio:UCrea Repositorio Abierto de la Universidad de Cantabria
Idioma:inglés
OAI Identifier:oai:repositorio.unican.es:10902/25205
Acceso en línea:http://hdl.handle.net/10902/25205
Access Level:acceso abierto
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spelling Magnetic order and disorder environments in superantiferromagnetic NdCu2 nanoparticlesMartín Jefremovas, Elizabeth|||0000-0001-8501-058X Svedlindh, P.Damay, F.Alba Venero, DiegoMichels, A.Blanco, J. A.Fernández Barquín, Luis|||0000-0003-4722-3722Magnetic nanoparticles exhibit two different local symmetry environments, one ascribed to the core and one corresponding to the nanoparticle surface. This implies the existence of a dual spin dynamics, leading to the presence of two different magnetic arrangements governed by different correlation lengths. In this work, two ensembles of NdCu2 nanoparticles with mean sizes of 18 nm and 13 nm have been produced to unravel the magnetic couplings established among the magnetic moments located within the core and at the nanoparticle surface. To this end, we have combined neutron diffraction measurements, appropriate to investigate magnetically-ordered spin arrangements, with time-dependent macroscopic AC susceptibility measurements to reveal memory and aging effects. The observation of the latter phenomena are indicative of magnetically-frustrated states. The obtained results indicate that, while the Nd3+ magnetic moments located within the nanoparticle core keep the bulk antiferromagnetic commensurate structure in the whole magnetic state, the correlations among the surface spins give rise to a collective frustrated spin-glass phase. The interpretation of the magnetic structure of the nanoparticles is complemented by specific-heat measurements, which further support the lack of incommensurability in the nanoparticle state.Acknowledgements: This work has been financially supported by Spain’s MCIU MAT2017-83631-C3-R and MAGNES AYD/2021/51822 (Principado de Asturias) projects. EMJs work was supported by ‘Beca Concepción Arenal’ BDNS: 406333 (Gobierno de Cantabria-Universidad de Cantabria). We acknowledge the Laboratoire Léon Brillouin (Proposal Number 820) and the ISIS Neutron and Muon Facility (Proposal Ref. 1910077) for allocation of beamtime and resources. We also acknowledge the Servicio de Microscopía Electrónica de Transmisión (SERMET, Universidad de Cantabria) for the TEM images.Nature Publishing GroupUniversidad de Cantabria20222022-01-01journal articlehttp://purl.org/coar/resource_type/c_6501NAhttp://purl.org/coar/version/c_be7fb7dd8ff6fe43info:eu-repo/semantics/articlehttp://hdl.handle.net/10902/25205Scientific reports (2022) 12:9733reponame:UCrea Repositorio Abierto de la Universidad de Cantabriainstname:Universidad de Cantabria (UC)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2Attribution 4.0 Internationalhttp://creativecommons.org/licenses/by/4.0/info:eu-repo/semantics/openAccessoai:repositorio.unican.es:10902/252052026-06-02T12:39:31Z
dc.title.none.fl_str_mv Magnetic order and disorder environments in superantiferromagnetic NdCu2 nanoparticles
title Magnetic order and disorder environments in superantiferromagnetic NdCu2 nanoparticles
spellingShingle Magnetic order and disorder environments in superantiferromagnetic NdCu2 nanoparticles
Martín Jefremovas, Elizabeth|||0000-0001-8501-058X
title_short Magnetic order and disorder environments in superantiferromagnetic NdCu2 nanoparticles
title_full Magnetic order and disorder environments in superantiferromagnetic NdCu2 nanoparticles
title_fullStr Magnetic order and disorder environments in superantiferromagnetic NdCu2 nanoparticles
title_full_unstemmed Magnetic order and disorder environments in superantiferromagnetic NdCu2 nanoparticles
title_sort Magnetic order and disorder environments in superantiferromagnetic NdCu2 nanoparticles
dc.creator.none.fl_str_mv Martín Jefremovas, Elizabeth|||0000-0001-8501-058X
Svedlindh, P.
Damay, F.
Alba Venero, Diego
Michels, A.
Blanco, J. A.
Fernández Barquín, Luis|||0000-0003-4722-3722
author Martín Jefremovas, Elizabeth|||0000-0001-8501-058X
author_facet Martín Jefremovas, Elizabeth|||0000-0001-8501-058X
Svedlindh, P.
Damay, F.
Alba Venero, Diego
Michels, A.
Blanco, J. A.
Fernández Barquín, Luis|||0000-0003-4722-3722
author_role author
author2 Svedlindh, P.
Damay, F.
Alba Venero, Diego
Michels, A.
Blanco, J. A.
Fernández Barquín, Luis|||0000-0003-4722-3722
author2_role author
author
author
author
author
author
dc.contributor.none.fl_str_mv Universidad de Cantabria
description Magnetic nanoparticles exhibit two different local symmetry environments, one ascribed to the core and one corresponding to the nanoparticle surface. This implies the existence of a dual spin dynamics, leading to the presence of two different magnetic arrangements governed by different correlation lengths. In this work, two ensembles of NdCu2 nanoparticles with mean sizes of 18 nm and 13 nm have been produced to unravel the magnetic couplings established among the magnetic moments located within the core and at the nanoparticle surface. To this end, we have combined neutron diffraction measurements, appropriate to investigate magnetically-ordered spin arrangements, with time-dependent macroscopic AC susceptibility measurements to reveal memory and aging effects. The observation of the latter phenomena are indicative of magnetically-frustrated states. The obtained results indicate that, while the Nd3+ magnetic moments located within the nanoparticle core keep the bulk antiferromagnetic commensurate structure in the whole magnetic state, the correlations among the surface spins give rise to a collective frustrated spin-glass phase. The interpretation of the magnetic structure of the nanoparticles is complemented by specific-heat measurements, which further support the lack of incommensurability in the nanoparticle state.
publishDate 2022
dc.date.none.fl_str_mv 2022
2022-01-01
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
NA
http://purl.org/coar/version/c_be7fb7dd8ff6fe43
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10902/25205
url http://hdl.handle.net/10902/25205
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
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.publisher.none.fl_str_mv Nature Publishing Group
publisher.none.fl_str_mv Nature Publishing Group
dc.source.none.fl_str_mv Scientific reports (2022) 12:9733
reponame:UCrea Repositorio Abierto de la Universidad de Cantabria
instname:Universidad de Cantabria (UC)
instname_str Universidad de Cantabria (UC)
reponame_str UCrea Repositorio Abierto de la Universidad de Cantabria
collection UCrea Repositorio Abierto de la Universidad de Cantabria
repository.name.fl_str_mv
repository.mail.fl_str_mv
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