127913 20241125101144.0 doi 10.1002/smtd.202300647 sideral 135018 ART-2023-135018 eng Muzzi, Beatrice Defect-Engineering by Solvent Mediated Mild Oxidation as a Tool to Induce Exchange Bias in Metal Doped Ferrites 2023 Access copy available to the general public Unrestricted The crystal site occupancy of different divalent ions and the induction of lattice defects represent an additional tool for modifying the intrinsic magnetic properties of spinel ferrites nanoparticles. Here, the relevance of the lattice defects is demonstrated in the appearance of exchange‐bias and in the improvement of the magnetic properties of doped ferrites of 20 nm, obtained from the mild oxidation of core@shell (wüstite@ferrite) nanoparticles. Three types of nanoparticles (Fe0.95O@Fe3O4, Co0.3Fe0.7O@Co0.8Fe2.2O4 and Ni0.17Co0.21Fe0.62O@Ni0.4Co0.3Fe2.3O4) are oxidized. As a result, the core@shell morphology is removed and transformed in a spinel‐like nanoparticle, through a topotactic transformation. This study shows that most of the induced defects in these nanoparticles and their magnetic properties are driven by the inability of the Co(II) ions at the octahedral sites to migrate to tetrahedral sites, at the chosen mild oxidation temperature. In addition, the appearance of crystal defects and antiphase boundaries improves the magnetic properties of the starting compounds and leads to the appearance of exchange bias at room temperature. These results highlight the validity of the proposed method to impose novel magnetic characteristics in the technologically relevant class of nanomaterials such as spinel ferrites, expanding their potential exploitation in several application fields. info:eu-repo/grantAgreement/EC/H2020/823717/EU/Enabling Science and Technology through European Electron Microscopy/ESTEEM3 This project has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement No H2020 823717-ESTEEM3 info:eu-repo/semantics/openAccess by http://creativecommons.org/licenses/by/3.0/es/ 10.7 2023 CHEMISTRY, PHYSICAL 26 / 178 = 0.146 2023 Q1 T1 NANOSCIENCE & NANOTECHNOLOGY 19 / 141 = 0.135 2023 Q1 T1 MATERIALS SCIENCE, MULTIDISCIPLINARY 47 / 439 = 0.107 2023 Q1 T1 3.107 2023 Materials Science (miscellaneous) 2023 Q1 Chemistry (miscellaneous) 2023 Q1 17.4 2023 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Albino, Martin Petrecca, Michele Innocenti, Claudia de Julián Fernández, César Bertoni, Giovanni Ibarra, M. Ricardo Universidad de Zaragoza (orcid)0000-0003-0681-8260 Christensen, Mogens Avdeev, Maxim Marquina, Clara (orcid)0000-0003-0602-492X Sangregorio, Claudio 2003 395 Universidad de Zaragoza Dpto. Física Materia Condensa. Área Física Materia Condensada (2023), 2300647 [12 pp.] SMALL METHODS 2366-9608 6344591 http://zaguan.unizar.es/record/127913/files/texto_completo.pdf Versión publicada 2460584 http://zaguan.unizar.es/record/127913/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:127913 articulos driver 2024-11-22-12:03:38 ARTICLE