Role of nanoparticle shape on the critical size for quasi-uniform ordering: From spheres to cubes through superballs

The equilibrium states of single-domain magnetite nanoparticles (NPs) result from a subtle interplay between size, geometry, and magnetocrystalline anisotropy. In this work, we present a micromagnetic study of shape-controlled magnetite NPs using the superball geometry, which provides a continuous i...

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Detalles Bibliográficos
Autores: López-Vázquez, Iago, Serantes, David, Iglesias, Òscar
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2025
País:España
Institución:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
Repositorio:Recercat. Dipósit de la Recerca de Catalunya
OAI Identifier:oai:recercat.cat:2445/225136
Acceso en línea:https://hdl.handle.net/2445/225136
Access Level:acceso abierto
Palabra clave:Nanopartícules
Magnetita
Propietats magnètiques
Nanoparticles
Magnetite
Magnetic properties
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spelling Role of nanoparticle shape on the critical size for quasi-uniform ordering: From spheres to cubes through superballsLópez-Vázquez, IagoSerantes, DavidIglesias, ÒscarNanopartículesMagnetitaPropietats magnètiquesNanoparticlesMagnetiteMagnetic propertiesThe equilibrium states of single-domain magnetite nanoparticles (NPs) result from a subtle interplay between size, geometry, and magnetocrystalline anisotropy. In this work, we present a micromagnetic study of shape-controlled magnetite NPs using the superball geometry, which provides a continuous interpolation between spheres and cubes. By isolating the influence of shape, we analyze the transition from quasi-uniform (single-domain) to vortex-like states as particle size increases, revealing critical sizes that depend on the superball exponent </p><p>. Our simulations show that faceted geometries promote the stabilization of vortex states at larger sizes, with marked distortions in the vortex core structure. The inclusion of cubic magnetocrystalline anisotropy, representative of magnetite, further lowers the critical size and introduces preferential alignment along the [111] easy axes. For isotropic shapes, the critical size for this transition increases with p, ranging from 49 nm for spheres to 56 nm for cubes, in agreement with experimental trends. In contrast, the presence of slight particle elongation increases the critical size and induces another preferential alignment direction. These results demonstrate that even small deviations from sphericity or aspect ratio significantly alter the magnetic ordering and stability of equilibrium magnetic states.Elsevier B.V.2026202620252026info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersion9 p.application/pdfhttps://hdl.handle.net/2445/225136Articles publicats en revistes (Física de la Matèria Condensada)reponame:Recercat. Dipósit de la Recerca de Catalunyainstname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)InglésReproducció del document publicat a: https://doi.org/10.1016/j.jmmm.2025.173751Journal of Magnetism and Magnetic Materials, 2025, vol. 638, p. 1-9https://doi.org/10.1016/j.jmmm.2025.173751cc-by-nc-nd (c) López-Vázquez, Iago, et al., 2025http://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessoai:recercat.cat:2445/2251362026-05-29T05:05:01Z
dc.title.none.fl_str_mv Role of nanoparticle shape on the critical size for quasi-uniform ordering: From spheres to cubes through superballs
title Role of nanoparticle shape on the critical size for quasi-uniform ordering: From spheres to cubes through superballs
spellingShingle Role of nanoparticle shape on the critical size for quasi-uniform ordering: From spheres to cubes through superballs
López-Vázquez, Iago
Nanopartícules
Magnetita
Propietats magnètiques
Nanoparticles
Magnetite
Magnetic properties
title_short Role of nanoparticle shape on the critical size for quasi-uniform ordering: From spheres to cubes through superballs
title_full Role of nanoparticle shape on the critical size for quasi-uniform ordering: From spheres to cubes through superballs
title_fullStr Role of nanoparticle shape on the critical size for quasi-uniform ordering: From spheres to cubes through superballs
title_full_unstemmed Role of nanoparticle shape on the critical size for quasi-uniform ordering: From spheres to cubes through superballs
title_sort Role of nanoparticle shape on the critical size for quasi-uniform ordering: From spheres to cubes through superballs
dc.creator.none.fl_str_mv López-Vázquez, Iago
Serantes, David
Iglesias, Òscar
author López-Vázquez, Iago
author_facet López-Vázquez, Iago
Serantes, David
Iglesias, Òscar
author_role author
author2 Serantes, David
Iglesias, Òscar
author2_role author
author
dc.subject.none.fl_str_mv Nanopartícules
Magnetita
Propietats magnètiques
Nanoparticles
Magnetite
Magnetic properties
topic Nanopartícules
Magnetita
Propietats magnètiques
Nanoparticles
Magnetite
Magnetic properties
description The equilibrium states of single-domain magnetite nanoparticles (NPs) result from a subtle interplay between size, geometry, and magnetocrystalline anisotropy. In this work, we present a micromagnetic study of shape-controlled magnetite NPs using the superball geometry, which provides a continuous interpolation between spheres and cubes. By isolating the influence of shape, we analyze the transition from quasi-uniform (single-domain) to vortex-like states as particle size increases, revealing critical sizes that depend on the superball exponent </p><p>. Our simulations show that faceted geometries promote the stabilization of vortex states at larger sizes, with marked distortions in the vortex core structure. The inclusion of cubic magnetocrystalline anisotropy, representative of magnetite, further lowers the critical size and introduces preferential alignment along the [111] easy axes. For isotropic shapes, the critical size for this transition increases with p, ranging from 49 nm for spheres to 56 nm for cubes, in agreement with experimental trends. In contrast, the presence of slight particle elongation increases the critical size and induces another preferential alignment direction. These results demonstrate that even small deviations from sphericity or aspect ratio significantly alter the magnetic ordering and stability of equilibrium magnetic states.
publishDate 2025
dc.date.none.fl_str_mv 2025
2026
2026
2026
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2445/225136
url https://hdl.handle.net/2445/225136
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Reproducció del document publicat a: https://doi.org/10.1016/j.jmmm.2025.173751
Journal of Magnetism and Magnetic Materials, 2025, vol. 638, p. 1-9
https://doi.org/10.1016/j.jmmm.2025.173751
dc.rights.none.fl_str_mv cc-by-nc-nd (c) López-Vázquez, Iago, et al., 2025
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
rights_invalid_str_mv cc-by-nc-nd (c) López-Vázquez, Iago, et al., 2025
http://creativecommons.org/licenses/by-nc-nd/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 9 p.
application/pdf
dc.publisher.none.fl_str_mv Elsevier B.V.
publisher.none.fl_str_mv Elsevier B.V.
dc.source.none.fl_str_mv Articles publicats en revistes (Física de la Matèria Condensada)
reponame:Recercat. Dipósit de la Recerca de Catalunya
instname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
instname_str Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
reponame_str Recercat. Dipósit de la Recerca de Catalunya
collection Recercat. Dipósit de la Recerca de Catalunya
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,811543

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