Crossover from individual to collective magnetism in dense nanoparticle systems: local anisotropy versus dipolar interactions

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dc.contributor.authorSánchez, Elena H.
dc.contributor.authorVasilakaki, Marianna
dc.contributor.authorLee, Su Seong
dc.contributor.authorNormile, Peter S.
dc.contributor.authorAndersson, Mikael S.
dc.contributor.authorMathieu, Roland
dc.contributor.authorLópez Ortega, Alberto
dc.contributor.authorPichon, Benoit P.
dc.contributor.authorPeddis, Davide
dc.contributor.authorBinns, Chris
dc.contributor.authorNordblad, Per
dc.contributor.authorTrohidou, Kalliopi
dc.contributor.authorNogués, Josep
dc.contributor.authorToro, José A. de
dc.contributor.departmentCienciases_ES
dc.contributor.departmentZientziakeu
dc.contributor.departmentInstitute for Advanced Materials and Mathematics - INAMAT2en
dc.contributor.funderUniversidad Pública de Navarra / Nafarroako Unibertsitate Publikoa, PJUPNA2020es
dc.date.accessioned2023-01-26T12:51:30Z
dc.date.available2023-01-26T12:51:30Z
dc.date.issued2022
dc.date.updated2023-01-26T11:56:17Z
dc.description.abstractDense systems of magnetic nanoparticles may exhibit dipolar collective behavior. However, two fundamental questions remain unsolved: i) whether the transition temperature may be affected by the particle anisotropy or it is essentially determined by the intensity of the interparticle dipolar interactions, and ii) what is the minimum ratio of dipole–dipole interaction (Edd) to nanoparticle anisotropy (KefV, anisotropy⋅volume) energies necessary to crossover from individual to collective behavior. A series of particle assemblies with similarly intense dipolar interactions but widely varying anisotropy is studied. The Kef is tuned through different degrees of cobalt-doping in maghemite nanoparticles, resulting in a variation of nearly an order of magnitude. All the bare particle compacts display collective behavior, except the one made with the highest anisotropy particles, which presents “marginal” features. Thus, a threshold of KefV/Edd ≈ 130 to suppress collective behavior is derived, in good agreement with Monte Carlo simulations. This translates into a crossover value of ≈1.7 for the easily accessible parameter TMAX(interacting)/TMAX(non-interacting) (ratio of the peak temperatures of the zero-field-cooled magnetization curves of interacting and dilute particle systems), which is successfully tested against the literature to predict the individual-like/collective behavior of any given interacting particle assembly comprising relatively uniform particles.en
dc.description.sponsorshipThe authors acknowledge financial support from grant No. MAT2015- 65295-R funded by MCIN/AEI/10.13039/501100011033 and by “ERDF A way of making Europe”, grant No. PID2019-106229RB-I00 funded by MCIN/AEI/10.13039/501100011033 and the Spanish MEC (through the contract No. BEAGAL18/00095). The authors also acknowledge funding from UCLM’s Plan Propio, the Swedish Research Council (VR), the Universidad Pública de Navarra (grant No. PJUPNA2020) and the Generalitat de Catalunya (grant No. 2017-SGR-292). ICN2 is funded by the CERCA program/Generalitat de Catalunya and supported by SEV2017-0706 grant funded by MCIN/AEI/10.13039/501100011033. K.T., D.P., and M.V. acknowledge support from the European Union’s Horizon 2020 Programme: under gran agreement No. 731976 (MAGENTA) and partially the Horizon Europe EIC Pathfinder Programme: under grant agreement No. 101046909 (REMAP).en
dc.format.mimetypeapplication/pdfen
dc.identifier.citationSánchez, E. H., Vasilakaki, M., Lee, S. S., Normile, P. S., Andersson, M. S., Mathieu, R., López‐Ortega, A., Pichon, B. P., Peddis, D., Binns, C., Nordblad, P., Trohidou, K., Nogués, J., & De Toro, J. A. (2022). Crossover from individual to collective magnetism in dense nanoparticle systems: Local anisotropy versus dipolar interactions. Small, 18(28), 2106762. https://doi.org/10.1002/smll.202106762en
dc.identifier.doi10.1002/smll.202106762
dc.identifier.issn1613-6810
dc.identifier.urihttps://academica-e.unavarra.es/handle/2454/44601
dc.language.isoengen
dc.publisherNano-Microen
dc.relation.ispartofSmall 2022, 18, 2106762en
dc.relation.projectIDinfo:eu-repo/grantAgreement/MINECO//MAT2015-65295-R/ES/
dc.relation.projectIDinfo:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2019-106229RB-I00/ES/
dc.relation.projectIDinfo:eu-repo/grantAgreement/MEC//BEAGAL18%2F00095/
dc.relation.projectIDinfo:eu-repo/grantAgreement/European Commission/Horizon 2020 Framework Programme/731976/
dc.relation.projectIDinfo:eu-repo/grantAgreement/European Commission/Horizon Europe/101046909/
dc.relation.publisherversionhttps://doi.org/10.1002/smll.202106762
dc.rights2022 The Authors. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly citeden
dc.rights.accessRightsinfo:eu-repo/semantics/openAccess
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectDipolar interactionsen
dc.subjectMagnetic anisotropyen
dc.subjectMagnetic nanoparticlesen
dc.subjectSuperspin glassen
dc.titleCrossover from individual to collective magnetism in dense nanoparticle systems: local anisotropy versus dipolar interactionsen
dc.typeinfo:eu-repo/semantics/article
dc.type.versioninfo:eu-repo/semantics/publishedVersion
dspace.entity.typePublication
relation.isAuthorOfPublicationc295cba6-cd13-4ee7-accd-0a1d5266c972
relation.isAuthorOfPublication.latestForDiscoveryc295cba6-cd13-4ee7-accd-0a1d5266c972

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