{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,23]],"date-time":"2026-06-23T10:36:36Z","timestamp":1782210996481,"version":"3.54.5"},"reference-count":55,"publisher":"Wiley","issue":"16","license":[{"start":{"date-parts":[[2022,3,10]],"date-time":"2022-03-10T00:00:00Z","timestamp":1646870400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Small"],"published-print":{"date-parts":[[2022,4]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>Nanometric core@shell w\u00fcstite@ferrite (Fe<jats:sub>1\u2212<\/jats:sub><jats:italic><jats:sub>x<\/jats:sub><\/jats:italic>O@Fe<jats:sub>3<\/jats:sub>O<jats:sub>4<\/jats:sub>) has been extensively studied because of the emergence of exchange bias phenomena.\u00a0Since 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\u2010coupled antiferromagnetic@ferrimagnetic nanoparticles (NPs) with ordering temperature close to 300 K by replacing the divalent iron with other transition\u2010metal ions. Here, the effect of the combined substitution of Fe<jats:sup>(II)<\/jats:sup>\u00a0with Co<jats:sup>(II)<\/jats:sup>\u00a0and Ni<jats:sup>(II)<\/jats:sup>\u00a0on the crystal structure and magnetic properties is studied. To this aim, a series of 20\u00a0nm NPs with a w\u00fcstite\u2010based core and a ferrite shell, with tailored composition, (Co<jats:sub>0.3<\/jats:sub>Fe<jats:sub>0.7<\/jats:sub>O@Co<jats:sub>0.8<\/jats:sub>Fe<jats:sub>2.2<\/jats:sub>O<jats:sub>4<\/jats:sub>\u00a0and Ni<jats:sub>0.17<\/jats:sub>Co<jats:sub>0.21<\/jats:sub>Fe<jats:sub>0.62<\/jats:sub>O@Ni<jats:sub>0.4<\/jats:sub>Co<jats:sub>0.3<\/jats:sub>Fe<jats:sub>2.3<\/jats:sub>O<jats:sub>4<\/jats:sub>) is synthetized through a thermal\u2010decomposition 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<jats:sup>(II)<\/jats:sup>\u00a0and Ni<jats:sup>(II)<\/jats:sup>\u00a0ions is performed. The dual\u2010doping is revealed to be an efficient way for tuning the magnetic properties of the final system, obtaining Ni\u2010Co doped iron oxide core@shell NPs with high coercivity (and therefore, high energy product), and increased antiferromagnetic ordering transition temperature, close to room temperature.<\/jats:p>","DOI":"10.1002\/smll.202107426","type":"journal-article","created":{"date-parts":[[2022,3,11]],"date-time":"2022-03-11T05:36:02Z","timestamp":1646976962000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":20,"title":["3d Metal Doping of Core@Shell W\u00fcstite@ferrite Nanoparticles as a Promising Route toward Room Temperature Exchange Bias Magnets"],"prefix":"10.1002","volume":"18","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9151-7723","authenticated-orcid":false,"given":"Beatrice","family":"Muzzi","sequence":"first","affiliation":[{"name":"Departament of Biotechnology Chemistry and Pharmacy University of Siena 1240  Siena I\u201053100 Italy"},{"name":"ICCOM \u2013 CNR  Sesto Fiorentino FI I\u201050019 Italy"},{"name":"Departament of Chemistry \u201cU. Schiff\u201d University of Florence and INSTM  Sesto Fiorentino FI I\u201050019 Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7438-0833","authenticated-orcid":false,"given":"Martin","family":"Albino","sequence":"additional","affiliation":[{"name":"Departament of Chemistry \u201cU. Schiff\u201d University of Florence and INSTM  Sesto Fiorentino FI I\u201050019 Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Michele","family":"Petrecca","sequence":"additional","affiliation":[{"name":"Departament of Chemistry \u201cU. Schiff\u201d University of Florence and INSTM  Sesto Fiorentino FI I\u201050019 Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Claudia","family":"Innocenti","sequence":"additional","affiliation":[{"name":"ICCOM \u2013 CNR  Sesto Fiorentino FI I\u201050019 Italy"},{"name":"Departament of Chemistry \u201cU. Schiff\u201d University of Florence and INSTM  Sesto Fiorentino FI I\u201050019 Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"C\u00e9sar de Juli\u00e1n","family":"Fern\u00e1ndez","sequence":"additional","affiliation":[{"name":"IMEM \u2013 CNR  Parma I\u201043124 Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Giovanni","family":"Bertoni","sequence":"additional","affiliation":[{"name":"CNR \u2013 Istituto Nanoscienze  Modena I\u201041125 Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Clara","family":"Marquina","sequence":"additional","affiliation":[{"name":"Instituto de Nanociencia y Materiales de Arag\u00f3n (INMA) Consejo Superior de Investigaciones Cient\u00edficas (CSIC)\u2010Universidad de Zaragoza  Zaragoza 50009 Spain"},{"name":"Departamento de F\u00edsica de la Materia Condensada Universidad de Zaragoza  Zaragoza 50009 Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Manuel Ricardo","family":"Ibarra","sequence":"additional","affiliation":[{"name":"Instituto de Nanociencia y Materiales de Arag\u00f3n (INMA) Consejo Superior de Investigaciones Cient\u00edficas (CSIC)\u2010Universidad de Zaragoza  Zaragoza 50009 Spain"},{"name":"Departamento de F\u00edsica de la Materia Condensada Universidad de Zaragoza  Zaragoza 50009 Spain"},{"name":"Laboratorio de Microscopias Avanzadas (LMA) Universidad de Zaragoza  Zaragoza 50018 Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2655-3901","authenticated-orcid":false,"given":"Claudio","family":"Sangregorio","sequence":"additional","affiliation":[{"name":"ICCOM \u2013 CNR  Sesto Fiorentino FI I\u201050019 Italy"},{"name":"Departament of Chemistry \u201cU. 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