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Large magnetic exchange coupling in rhombus-shaped nanographenes with zigzag periphery

Shantanu Mishra1*, Xuelin Yao2, Qiang Chen2, Kristjan Eimre1, Oliver Gröning1, Ricardo Ortiz3,4, Marco Di Giovannantonio1, Juan Carlos Sancho-García4, Joaquín Fernández-Rossier5, Carlo A. Pignedoli1, Klaus Müllen2, Pascal Ruffieux1, Akimitsu Narita2,6, Roman Fasel1,7*

1 Empa - Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, 8600 Dübendorf, Switzerland

2 Department of Synthetic Chemistry, Max Planck Institute for Polymer Research, 55021 Mainz, Germany

3 Department of Applied Physics, University of Alicante, Sant Vicent del Raspeig, Spain

4 Department of Chemical Physics, University of Alicante, Sant Vicent del Raspeig, Spain

5 QuantaLab, International Iberian Nanotechnology Laboratory, Braga, Portugal

6 Organic and Carbon Nanomaterials Unit, Okinawa Institute of Science and Technology Graduate University, Okinawa, Japan

7 Department of Chemistry and Biochemistry, University of Bern, Bern, Switzerland

* Corresponding authors emails: shantanu.mishra@empa.ch, roman.fasel@empa.ch
DOI10.24435/materialscloud:vv-y6 [version v1]

Publication date: Oct 28, 2021

How to cite this record

Shantanu Mishra, Xuelin Yao, Qiang Chen, Kristjan Eimre, Oliver Gröning, Ricardo Ortiz, Marco Di Giovannantonio, Juan Carlos Sancho-García, Joaquín Fernández-Rossier, Carlo A. Pignedoli, Klaus Müllen, Pascal Ruffieux, Akimitsu Narita, Roman Fasel, Large magnetic exchange coupling in rhombus-shaped nanographenes with zigzag periphery, Materials Cloud Archive 2021.178 (2021), doi: 10.24435/materialscloud:vv-y6.

Description

In this record we provide data to support our recent findings for the magnetic properties of rhombus-shaped nanographenes. Nanographenes with zigzag edges are predicted to manifest non-trivial π-magnetism resulting from the interplay of concurrent electronic effects, such as hybridization of localized frontier states and Coulomb repulsion between valence electrons. This provides a chemically tunable platform to explore quantum magnetism at the nanoscale and opens avenues towards organic spintronics. The magnetic stability in nanographenes is thus far greatly limited by the weak magnetic exchange coupling, which remains below the room-temperature thermal energy. In our work, we report the synthesis of large rhombus-shaped nanographenes with zigzag peripheries on gold and copper surfaces. Single-molecule scanning probe measurements show an emergent magnetic spin singlet ground state with increasing nanographene size. The magnetic exchange coupling in the largest nanographene (C70H22, containing five benzenoid rings along each edge), determined by inelastic electron tunnelling spectroscopy, exceeds 100 meV or 1,160 K, which outclasses most inorganic nanomaterials and survives on a metal electrode.

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Files and data are licensed under the terms of the following license: Creative Commons Attribution 4.0 International.
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External references

Journal reference (Manuscript where the results are discussed)
S. Mishra, X. Yao, Q. Chen, K. Eimre, O. Gröning, R. Ortiz, M. Di Giovannantonio, J. C. Sancho-García, J. Fernández-Rossier, C. A. Pignedoli, K. Müllen, P. Ruffieux, A Narita and R. Fasel, Nat. Chem. 13, 581-586 (2021). doi:10.1038/s41557-021-00678-2

Keywords

nanographenes magnetic carbon ab initio MARVEL/DD3 SNSF CSCS Horizon 2020 Graphene flagship

Version history:

2021.178 (version v1) [This version] Oct 28, 2021 DOI10.24435/materialscloud:vv-y6