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While non\u2010covalent approaches have been widely explored, they often fail to provide robust interfaces for real applications. We report here covalent surface modification of cobalt ferrite (CoFe\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>4<\/jats:sub>\n                    ) nanoparticles (NPs) using a series of judiciously selected aryl diazonium salts to achieve a higher degree of surface functionalization and strong interfacial electronic coupling. This modification establishes robust carbon\u2013metal (C\u2013M) covalent bonds at the nanoparticle\u2013molecule interface, conferring chemical stability and tunable magnetic properties. Notably, \u03c0\u2010electron\u2010rich aryl compounds transform pristine superparamagnetic CoFe\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>4<\/jats:sub>\n                    NPs into room\u2010temperature ferromagnets, with a significant increase in coercivity, remanent magnetization, and saturation magnetization, attributed to enhanced surface spin ordering on different sublattices and elevated effective anisotropy. Zero\u2010field\u2010cooled and field\u2010cooled magnetization measurements reveal elevated blocking (T\n                    <jats:sub>b<\/jats:sub>\n                    ) and irreversibility (T\n                    <jats:sub>irr<\/jats:sub>\n                    ) temperatures, further confirmed by thermoremanent magnetization, with T\n                    <jats:sub>b<\/jats:sub>\n                    rising from 245.9\u00a0K in pristine NPs to 336.8\u00a0K in aryl\u2010functionalized\u2010CoFe\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>4<\/jats:sub>\n                    NPs. Molecular\u2010level modeling further supports the origin of ferromagnetism in aryl\u2010functionalized\u2010CoFe\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>4<\/jats:sub>\n                    NPs. Chemical functionalization of magnetic nanoparticles offers a versatile strategy to tune the magnetic properties of pristine nanoparticles for applications in spintronics, spin\u2010based memory, and spin logic.\n                  <\/jats:p>","DOI":"10.1002\/anie.202514779","type":"journal-article","created":{"date-parts":[[2025,11,25]],"date-time":"2025-11-25T06:37:16Z","timestamp":1764052636000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Turning Superparamagnetic Nanoparticles Into Ferromagnetic at Room Temperature via Molecular Functionalization for Magnetic Memory Applications"],"prefix":"10.1002","volume":"65","author":[{"given":"Neha","family":"Singh","sequence":"first","affiliation":[{"name":"Department of Chemistry Indian Institute of Technology  Kanpur Uttar Pradesh 208016 India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Anurag","family":"Pritam","sequence":"additional","affiliation":[{"name":"Department of Chemistry Indian Institute of Technology  Kanpur Uttar Pradesh 208016 India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Vikram","family":"Singh","sequence":"additional","affiliation":[{"name":"Electrochemical Processes Unit IMDEA Energy Institute  Avda. 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