Competitive size effects in antiferromagnetic ferrimagnetic core shell nanoparticles for large exchange bias

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dc.contributor.authorLópez Ortega, Alberto
dc.contributor.authorMuzzi, Beatrice
dc.contributor.authorJulián Fernández, César de
dc.contributor.authorSangregorio, Claudio
dc.contributor.departmentCienciases_ES
dc.contributor.departmentZientziakeu
dc.contributor.departmentInstitute for Advanced Materials and Mathematics - INAMAT2en
dc.date.accessioned2025-01-27T08:46:06Z
dc.date.issued2024-12-04
dc.date.updated2025-01-27T08:28:16Z
dc.description.abstractA family of exchange-coupled core—shell (CS) nanoparticles composed of an antiferromagnetic (AFM) core (Co0.3Fe0.7O) and a ferrimagnetic (FiM) shell (Co0.6Fe2.4O4) was investigated to unravel the role played by the dimension of the two components on the magnetic properties of the system. The series comprises three samples with different core diameters (2, 5, and 16 nm) and fixed shell thickness of ~2 nm. Although a strong core and shell magnetic coupling occurs in all the samples, the final properties of the hybrid nanosystems are greatly influenced by the size of the two counterparts. Indeed, while the larger sample can be described as a classic TC > TN exchange-bias, where TC and TN denote the ordering temperature of the FiM and AFM phases, respectively, on reducing the size, the blocking transition of the FiM shell decreases to values well below the TN of the AFM. In the first case, the FiM-AFM exchange-bias effect is determined by the magnetic ordering of the AFM core; in the other cases, it is due to the reduction of the thermal-driven magnetic fluctuations of the ordered FiM shell. On the other hand, the AFM properties of the core regions also are extremely sensitive to the particle size reduction, showing, for the smallest sample, the effect of the coupling between the two phases to appear at temperature well below TN displayed by the bulk system, indicating the potential presence of a blocking transition in the AFM core for small particles. These findings highlight the significant influence of the size of the AFM and FiM components on the hybrid system's ultimate properties. This result is potentially relevant for defining the working conditions of nanodevices exploiting exchange-bias phenomena, which have been recently proposed in the literature for application in several technological fields, ranging from rare-earth free magnets, spintronics, optoelectronics, and magnetic-refrigeration.en
dc.description.sponsorshipA.L.O. acknowledges financial support from the grants PID2021-122613OB-I00 and CNS2022-135787 funded by MCIN/AEI/10.13039/501100011033. B.M. and C.S. acknowledge financial support from National Recovery and Resilience Plan (NRRP), Mission 4 Component 2 Investment 1.3—Call for tender No. 1561 of 11.10.2022 of Ministero dell'Università e della Ricerca (MUR), the European Union—Next Generation EU and Project code PE0000021, CUP B53C22004060006, Title "NEST—Network 4 Energy Sustainable Transition". C.dJ.F. acknowledges the European Union—Next GenerationEU that supports the National Sustainable Mobility Center CN00000023, Italian Ministry of University and Research Decree no. 1033—17/06/2022, Spoke 11—"Innovative Materials & Lightweighting".
dc.embargo.lift2025-12-04
dc.embargo.terms2025-12-04
dc.format.mimetypeapplication/pdfen
dc.identifier.citationLópez-Ortega, A., Muzzi, B., Julián Fernández, C. de, Sangregorio, C. (2024). Competitive size effects in antiferromagnetic ferrimagnetic core shell nanoparticles for large exchange bias. ACS Applied Nano Materials, 7(23), 27489-27497. https://doi.org/10.1021/acsanm.4c05505.
dc.identifier.doi10.1021/acsanm.4c05505
dc.identifier.issn2574-0970
dc.identifier.urihttps://academica-e.unavarra.es/handle/2454/53094
dc.language.isoeng
dc.publisherAmerican Chemical Society
dc.relation.ispartofACS Applied Nano Materials (2024), vol. 7, núm. 23
dc.relation.projectIDinfo:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2021-2023/PID2021-122613OB-I00/ES/
dc.relation.projectIDinfo:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2021-2023/CNS2022-135787/
dc.relation.publisherversionhttps://doi.org/10.1021/acsanm.4c05505
dc.rights© 2024 American Chemical Society
dc.rights.accessRightsinfo:eu-repo/semantics/embargoedAccess
dc.subjectNanoparticlesen
dc.subjectCore|shellen
dc.subjectExchange biasen
dc.subjectAntiferromagneten
dc.subjectBlocking temperatureen
dc.titleCompetitive size effects in antiferromagnetic ferrimagnetic core shell nanoparticles for large exchange biasen
dc.typeinfo:eu-repo/semantics/article
dc.type.versioninfo:eu-repo/semantics/acceptedVersion
dspace.entity.typePublication
relation.isAuthorOfPublicationc295cba6-cd13-4ee7-accd-0a1d5266c972
relation.isAuthorOfPublication.latestForDiscoveryc295cba6-cd13-4ee7-accd-0a1d5266c972

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