Significant Surface Spin Effects and Exchange Bias in Iron Oxide-Based Hollow Magnetic Nanoparticles
dc.contributor.author | García Acevedo, Pelayo | |
dc.contributor.author | González Gómez, Manuel A. | |
dc.contributor.author | Arnosa Prieto, Ángela | |
dc.contributor.author | Saiz Garitaonandia, José Javier | |
dc.contributor.author | Piñeiro, Yolanda | |
dc.contributor.author | Rivas, José | |
dc.date.accessioned | 2022-02-16T19:23:08Z | |
dc.date.available | 2022-02-16T19:23:08Z | |
dc.date.issued | 2022-01-28 | |
dc.identifier.citation | Nanomaterials 12(3) : (2022) // Article ID 456 | es_ES |
dc.identifier.issn | 2079-4991 | |
dc.identifier.uri | http://hdl.handle.net/10810/55495 | |
dc.description.abstract | Exchange bias (EB) properties have become especially important in hollow magnetic nanoparticles (MNPs) due to the versatility and reduced size of these materials. In this work, we present the synthesis and study of the EB properties of iron-oxide-based hollow MNPs and their precursors Fe/iron oxide MNPs with core/void/shell structure. The two mechanisms involved in EB generation were investigated: the frozen spins present in the nanograins that form the nanoparticles and the surface spins. The effect of external parameters on the coercivity (HC), remanence (MR), exchange bias field (HEB) and frozen spins, such as cooling field (HFC) and temperature, was investigated. Both HC and HEB present a maximum threshold above which their values begin to decrease with HFC, showing a new trend of HEB with HFC and allowing modulation on demand. The existence of surface spins, present on the outer and inner surfaces, was demonstrated, and an intrinsic EB phenomenon (HEB = 444 Oe for hollow iron oxide-based MNPs of 13.1 nm) with significant magnetization (MS~50 emu/g) was obtained. Finally, core/void/shell MNPs of 11.9 nm prior to the formation of the hollow MNPs showed a similar behavior, with non-negligible HEB, highlighting the importance of surface spins in EB generation. | es_ES |
dc.description.sponsorship | This work was supported by the European Commission under the BOW project, (FETPROACT-EIC-05-2019, Grant 952183), and partially supported by the Spanish Ministry of Science and Innovation (PID2020-112626RB-C21), Modalities «Research Challenges» and «Knowledge Generation», and the Regional Consellería de Innovacion Program for the Grupos de Referencia Competitiva 2021—GRC2021 project of Xunta de Galicia. | es_ES |
dc.language.iso | eng | es_ES |
dc.publisher | MDPI | es_ES |
dc.relation | info:eu-repo/grantAgreement/MCIN/PID2020-112626RB-C21 | es_ES |
dc.relation | info:eu-repo/grantAgreement/EC/H2020/952183 | es_ES |
dc.rights | info:eu-repo/semantics/openAccess | es_ES |
dc.rights.uri | http://creativecommons.org/licenses/by/3.0/es/ | |
dc.subject | magnetic nanoparticles | es_ES |
dc.subject | nanomagnetism | es_ES |
dc.subject | exchange bias | es_ES |
dc.subject | surface spins | es_ES |
dc.subject | interfacial effects | es_ES |
dc.title | Significant Surface Spin Effects and Exchange Bias in Iron Oxide-Based Hollow Magnetic Nanoparticles | es_ES |
dc.type | info:eu-repo/semantics/article | es_ES |
dc.date.updated | 2022-02-11T14:46:51Z | |
dc.rights.holder | © 2022 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). | es_ES |
dc.relation.publisherversion | https://www.mdpi.com/2079-4991/12/3/456 | es_ES |
dc.identifier.doi | 10.3390/nano12030456 | |
dc.contributor.funder | European Commission | |
dc.departamentoes | Física | |
dc.departamentoeu | Fisika |
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Except where otherwise noted, this item's license is described as © 2022 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).