Dresden 2017 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 20: Bio- and Molecular Magnetism
MA 20.6: Vortrag
Dienstag, 21. März 2017, 10:45–11:00, HSZ 301
Magnetism of highly-ordered two-dimensional arrays of Fe4 on graphene — •Fabian Paschke1, Luca Gragnaniello1, Philipp Erler1, Peter Schmitt2, Nicole Barth1, Sabina Simon1, Harald Brune3, Stefano Rusponi3, and Mikhail Fonin1 — 1Department of Physics, University of Konstanz, Germany — 2Department of Chemistry, University of Konstanz, Germany — 3Institute of Condensed Matter Physics, École Polytechnique Fédérale de Lausanne, Switzerland
We demonstrate that electrospray deposition enables the fabrication of highly-periodic 2D arrays of Fe4H single molecule magnets on graphene/Ir(111). From the magnetic field dependence of the x-ray magnetic circular dichroism signal, we infer that the magnetic easy axis of each Fe4H molecule is oriented perpendicular to the sample surface with the value of the uniaxial anisotropy being unaffected upon the deposition on graphene. Furthermore, we observe inelastic features in STS, due to spin-flip excitations from the magnetic ground state, giving access to the intramolecular exchange coupling J1 on the single-molecule level, which is unprecedentedly close to the bulk value. Our findings suggest that Fe4H molecules undergo only negligible interaction with the graphene/Ir(111) substrate, making it possible to build a well-defined two-dimensional system with preserved magnetic properties as compared to bulk.