Journal
SMALL
Volume 17, Issue 35, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202102753
Keywords
lanthanides; magnetic anisotropy; metal-organic networks; single atom magnetism; X-ray magnetic circular dichroism
Categories
Funding
- European Research Council (ERC) [766555]
- Marie Sklodowska-Curie Actions (MSCA) under the European Union's Horizon 2020 research and innovation programme [894924]
- Spanish Ministerio de Economia, Industria y Competitividad [FIS2016-78591-C3-1-R, RTI2018-097895-B-C42, MAT2016-78293-C6-2-R, MAT2017-85089-C2-1-R, PID2019-107338RB-C65]
- Comunidad de Madrid [S2013/MIT-2850, P2018/NMT4321, S2018/NMT-4367]
- European Regional Development Fund (ERDF) under the program Interreg V-A Espana-Francia-Andorra [EFA 194/16 TNSI]
- Severo Ochoa Programme for Centres of Excellence in RD [SEV-2016-0686, SEV-2017-0706]
- Marie Curie Actions (MSCA) [894924] Funding Source: Marie Curie Actions (MSCA)
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The study investigates the electronic and magnetic properties of Dy-carboxylate metal-organic networks on Cu(111), revealing that surface-supported metal-organic coordination can alter the orientation of the easy magnetization axis of Dy coordinative centers and enhance magnetic anisotropy significantly. This opens up new possibilities to customize the magnetic anisotropy and magnetic moments of lanthanide elements on surfaces.
Taming the magnetic anisotropy of lanthanides through coordination environments is crucial to take advantage of the lanthanides properties in thermally robust nanomaterials. In this work, the electronic and magnetic properties of Dy-carboxylate metal-organic networks on Cu(111) based on an eightfold coordination between Dy and ditopic linkers are inspected. This surface science study based on scanning probe microscopy and X-ray magnetic circular dichroism, complemented with density functional theory and multiplet calculations, reveals that the magnetic anisotropy landscape of the system is complex. Surface-supported metal-organic coordination is able to induce a change in the orientation of the easy magnetization axis of the Dy coordinative centers as compared to isolated Dy atoms and Dy clusters, and significantly increases the magnetic anisotropy. Surprisingly, Dy atoms coordinated in the metallosupramolecular networks display a nearly in-plane easy magnetization axis despite the out-of-plane symmetry axis of the coordinative molecular lattice. Multiplet calculations highlight the decisive role of the metal-organic coordination, revealing that the tilted orientation is the result of a very delicate balance between the interaction of Dy with O atoms and the precise geometry of the crystal field. This study opens new avenues to tailor the magnetic anisotropy and magnetic moments of lanthanide elements on surfaces.
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