Deposition of chiral heptahelicene molecules on ferromagnetic Co and Fe thin-film substrates

0561708 - FZÚ 2023 RIV CH eng J - Journal Article
Safari, M.R. - Matthes, F. - Ernst, Karl-Heinz - Bürgler, D.E. - Schneider, C. M.
Deposition of chiral heptahelicene molecules on ferromagnetic Co and Fe thin-film substrates.
Nanomaterials. Roč. 12, č. 19 (2022), č. článku 3281. E-ISSN 2079-4991
Institutional support: RVO:68378271
Keywords : chiral molecules * molecular deposition * ferromagnetic surfaces * adsorption geometry * STM
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 5.3, year: 2022
Method of publishing: Open access

The discovery of chirality-induced spin selectivity (CISS), resulting from an interaction between the electron spin and handedness of chiral molecules, has sparked interest in surface-adsorbed chiral molecules due to potential applications in spintronics, enantioseparation, and enantioselective chemical or biological processes. We study the deposition of chiral heptahelicene by sublimation under ultra-high vacuum onto bare Cu(111), Co bilayer nanoislands on Cu(111), and Fe bilayers on W(110) by low-temperature spin-polarized scanning tunneling microscopy/spectroscopy (STM/STS). In all cases, the molecules remain intact and adsorb with the proximal phenanthrene group aligned parallel to the surface. Three degenerate in-plane orientations on Cu(111) and Co(111), reflecting substrate symmetry, and only two on Fe(110), i.e., fewer than symmetry permits, indicate a specific adsorption site for each substrate.

Permanent Link: https://hdl.handle.net/11104/0334224