Regensburg 2022 – scientific programme

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O: Fachverband Oberflächenphysik

O 5: Organic Molecules at Surfaces 1: Substrate Effects

O 5.9: Talk

Monday, September 5, 2022, 12:45–13:00, S051

Growth of chiral heptahelicene molecules on ferromagnetic Co and Fe thin-film substrates — •Mohammad Reza Safari, Frank Matthes, Daniel E. Bürgler, and Claus M. Schneider — Peter Grünberg Institut (PGI-6), Forschungszentrum Jülich, 52425 Jülich, Germany

The discovery of chirality-induced spin selectivity effects [1,2], which result from an interaction between the electron spin and the handedness of chiral molecules, has sparked interest in surface-adsorbed chiral molecules due to potential applications in spintronics, enantioseparation, and chemical sensing. Here, we report growth studies of chiral heptahelicene molecules on two monolayers Fe on W(110), Co bilayer nano-islands on Cu(111), and for comparison on Cu(111) by low-temperature spin-polarized scanning tunneling microscopy. In all cases, the molecules remain intact, adsorb in a flat configuration, and exhibit specific in-plane orientations that reflect the symmetry of the substrate lattices. The Co and Fe layers remain out-of-plane magnetized after molecular adsorption. In addition, we are able to determine the helicity of individual molecules adsorbed on the highly reactive Fe and Co surfaces in a similar manner as previously reported for the less reactive Cu(111) surface [3]. These observations pave the way for further investigations of CISS effects in well-defined molecule-substrate systems on the single-molecule scale as a basis for theoretical modeling.

[1] B. Göhler et al., Science 331, 894 (2011). [2] K. Banerjee-Ghosh et al., Science 360, 1331 (2018). [3] K.-H. Ernst et al., Nano Lett. 15, 5388 (2015).