118008 20240319080944.0 doi 10.1002/SMLL.202107426 sideral 129128 ART-2022-129128 eng Muzzi, Beatrice 3d Metal doping of Core@shell Wüstite@ferrite nanoparticles as a promising route toward room temperature exchange bias magnets 2022 Access copy available to the general public Unrestricted Nanometric core@shell wüstite@ferrite (Fe1−xO@Fe3O4) has been extensively studied because of the emergence of exchange bias phenomena. Since their actual implementation in modern technologies is hampered by the low temperature at which bias is operating, the critical issue to be solved is to obtain exchange-coupled antiferromagnetic@ferrimagnetic nanoparticles (NPs) with ordering temperature close to 300 K by replacing the divalent iron with other transition-metal ions. Here, the effect of the combined substitution of Fe(II) with Co(II) and Ni(II) on the crystal structure and magnetic properties is studied. To this aim, a series of 20 nm NPs with a wüstite-based core and a ferrite shell, with tailored composition, (Co0.3Fe0.7O@Co0.8Fe2.2O4 and Ni0.17Co0.21Fe0.62O@Ni0.4Co0.3Fe2.3O4) is synthetized through a thermal-decomposition method. An extensive morphological and crystallographic characterization of the obtained NPs shows how a higher stability against the oxidation process in ambient condition is attained when divalent cation doping of the iron oxide lattice with Co(II) and Ni(II) ions is performed. The dual-doping is revealed to be an efficient way for tuning the magnetic properties of the final system, obtaining Ni-Co doped iron oxide core@shell NPs with high coercivity (and therefore, high energy product), and increased antiferromagnetic ordering transition temperature, close to room temperature. info:eu-repo/grantAgreement/EC/H2020/720853/EU/Anisometric permanent hybrid magnets based on inexpensive and non-critical materials/AMPHIBIAN This project has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement No H2020 720853-AMPHIBIAN info:eu-repo/semantics/openAccess by http://creativecommons.org/licenses/by/3.0/es/ 13.3 2022 CHEMISTRY, PHYSICAL 19 / 161 = 0.118 2022 Q1 T1 MATERIALS SCIENCE, MULTIDISCIPLINARY 29 / 343 = 0.085 2022 Q1 T1 NANOSCIENCE & NANOTECHNOLOGY 15 / 107 = 0.14 2022 Q1 T1 PHYSICS, CONDENSED MATTER 7 / 67 = 0.104 2022 Q1 T1 CHEMISTRY, MULTIDISCIPLINARY 18 / 178 = 0.101 2022 Q1 T1 PHYSICS, APPLIED 11 / 160 = 0.069 2022 Q1 T1 3.395 2022 Biomaterials 2022 Q1 Biotechnology 2022 Q1 Chemistry (miscellaneous) 2022 Q1 Nanoscience and Nanotechnology 2022 Q1 Materials Science (miscellaneous) 2022 Q1 Medicine (miscellaneous) 2022 Q1 Engineering (miscellaneous) 2022 Q1 19.0 2022 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Albino, Martin Petrecca, Michele Innocenti, Claudia Fernández, César de Julián Bertoni, Giovanni Marquina, Clara (orcid)0000-0003-0602-492X Ibarra, Manuel Ricardo Universidad de Zaragoza (orcid)0000-0003-0681-8260 Sangregorio, Claudio 2003 395 Universidad de Zaragoza Dpto. Física Materia Condensa. Área Física Materia Condensada 18, 16 (2022), 2107426 [11 pp.] Small Small 1613-6810 2379937 http://zaguan.unizar.es/record/118008/files/texto_completo.pdf Versión publicada 2460324 http://zaguan.unizar.es/record/118008/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:118008 articulos driver 2024-03-18-12:28:52 ARTICLE