Ferromagnetism on an atom-thick & extended 2D metal-organic coordination network

Jorge Lobo-Checa (), Leyre Hernández-López, Mikhail M. Otrokov (), Ignacio Piquero-Zulaica, Adriana E. Candia, Pierluigi Gargiani, David Serrate, Fernando Delgado, Manuel Valvidares, Jorge Cerdá, Andrés Arnau () and Fernando Bartolomé ()
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Jorge Lobo-Checa: CSIC-Universidad de Zaragoza
Leyre Hernández-López: CSIC-Universidad de Zaragoza
Mikhail M. Otrokov: Centro de Física de Materiales CSIC/UPV-EHU-Materials Physics Center
Ignacio Piquero-Zulaica: Technical University of Munich
Adriana E. Candia: CSIC-Universidad de Zaragoza
Pierluigi Gargiani: ALBA Synchrotron Light Source
David Serrate: CSIC-Universidad de Zaragoza
Fernando Delgado: Universidad de La Laguna, C/Astrofísico Francisco Sánchez, s/n
Manuel Valvidares: ALBA Synchrotron Light Source
Jorge Cerdá: CSIC
Andrés Arnau: Centro de Física de Materiales CSIC/UPV-EHU-Materials Physics Center
Fernando Bartolomé: CSIC-Universidad de Zaragoza

Nature Communications, 2024, vol. 15, issue 1, 1-8

Abstract: Abstract Ferromagnetism 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.

Date: 2024
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DOI: 10.1038/s41467-024-46115-z

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