SKM 2023 – scientific programme

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O: Fachverband Oberflächenphysik

O 50: Spins on Surfaces at the Atomic Scale IV

O 50.4: Talk

Wednesday, March 29, 2023, 11:15–11:30, REC C 213

Tuning the magnetic properties of self-assembled molecular networks on Au(111) and graphene — •Adam J. Watson, Koen Houtsma, Mihaela Enache, Antonija Grubišić Čabo, and Meike Stöhr — Zernike Institute for Advanced Materials, University of Groningen, 9747 AG, Groningen, The Netherlands

The ability to manipulate the spin state of low dimensional magnetic networks is of emerging interest and forms the basis of prospective technologies in the atomic limit. These include molecule-based quantum computers and spintronic devices, which require addressable spin architectures. Recently, two-dimensional (2D) networks have been prepared using the methods of on-surface supramolecular self-assembly, exhibiting a variety of different magnetic exchange interactions which are experimentally accessible. [1]

In this work, we performed scanning tunnelling spectroscopy (STS) and x-ray magnetic circular dichroism (XMCD) measurements to characterize the magnetic properties of self-assembled networks of a cyano-functionalized cobalt-porphyrin derivative (CoTCPP) on Au(111) [2] and graphene. Kondo and XMCD measurements indicate a variation in spin-substrate coupling with bonding motif, and variations in magnetic moment and spin distribution. These results highlight the importance of the bonding motif within supramolecular architectures, and the role of the substrate, in tuning molecular magnetism.

[1] Girovsky, J. et al., Nat. Comm. 8 (2017) 15388

[2] B. D. Baker Cortes et al., J. Phys. Chem. C 123 (2019) 19681