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Berlin 2018 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 21: Poster I

MA 21.112: Poster

Dienstag, 13. März 2018, 09:30–13:00, Poster A

Chemical doping of Fe4 single molecule magnets on surfaces — •Vivien Enenkel, Fabian Paschke, Philipp Erler, Luca Gragnaniello, and Mikhail Fonin — Fachbereich Physik, Universität Konstanz, 78457 Konstanz, Germany

Single molecules magnets are promising candidates for future applications in the field of molecular spintronics or ultra-dense information storage. Here we investigate the effect of chemical doping by alkali metals on Fe4H molecules on graphene/Ir(111) and Au(111) surfaces. Submonolayers of intact Fe4H molecules in form of close-packed islands are prepared on surfaces via the electrospray ionization method [1,2]. The subsequent deposition of dopant atoms (Li, Na) leads to appearance of a new molecular configuration appearing bright and slightly asymmetric compared to the rest of the molecules. We assume that in this configuration a dopant atom resides on the Fe4H molecule, which leads to the direct electron transfer from Li (Na) to one of the Fe atoms. STS spectra on doped species show a shift in the energetic positions of molecular orbitals as well as further electronic states emerging in the conduction gap as compared to undoped molecules. By means of x-ray absorption spectroscopy, we observe that doping leads to substantial changes in the line shape of the Fe L-edge indicating the reduction of Fe3+ to Fe2+ in the molecular core.

[1] P. Erler et al., Nano Lett. 15, 4546 (2015). [2] L. Gragnaniello et al., Nano Lett., 2017, in press.

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