doi:10.1038/s41467-024-46115-zengLobo-Checa, JorgeHernández-López, LeyreOtrokov, Mikhail M.Piquero-Zulaica, IgnacioCandia, Adriana E.Gargiani, PierluigiSerrate, DavidDelgado, FernandoValvidares, ManuelCerdá, JorgeArnau, AndrésBartolomé, FernandoFerromagnetism on an atom-thick & extended 2D metal-organic coordination networkART-2024-137861Ferromagnetism is the collective alignment of atomic spins that retain a net magnetic moment below the Curie temperature, even in the absence of external magnetic fields. Reducing this fundamental property into strictly two-dimensions was proposed in metal-organic coordination networks, but thus far has eluded experimental realization. In this work, we demonstrate that extended, cooperative ferromagnetism is feasible in an atomically thin two-dimensional metal-organic coordination network, despite only ≈ 5% of the monolayer being composed of Fe atoms. The resulting ferromagnetic state exhibits an out-of-plane easy-axis square-like hysteresis loop with large coercive fields over 2 Tesla, significant magnetic anisotropy, and persists up to TC ≈ 35 K. These properties are driven by exchange interactions mainly mediated by the molecular linkers. Our findings resolve a two decade search for ferromagnetism in two-dimensional metal-organic coordination networks.2024http://zaguan.unizar.es/record/13315610.1038/s41467-024-46115-zhttp://zaguan.unizar.es/record/133156oai:zaguan.unizar.es:133156info:eu-repo/grantAgreement/ES/AEI/PID2019-107338RB-C64info:eu-repo/grantAgreement/ES/DGA/E12-20Rinfo:eu-repo/grantAgreement/ES/DGA/E13-20Rinfo:eu-repo/grantAgreement/EUR/INTERREG V-A/EFA 194-16-TNSIinfo:eu-repo/grantAgreement/ES/MICINN-AEI/PRTR-C17.I1info:eu-repo/grantAgreement/ES/MICINN/PID2019-103910GB-I00info:eu-repo/grantAgreement/ES/MICINN/PID2020-115159GB-I00info:eu-repo/grantAgreement/ES/MINECO/RED2018-102833-TNature communications 15, 1 (2024), 1858 [8 pp.]byhttps://creativecommons.org/licenses/by/4.0/deed.esinfo:eu-repo/semantics/openAccess