Regensburg 2025 – scientific programme
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O: Fachverband Oberflächenphysik
O 80: Organic Molecules on Inorganic Substrates: Electronic, Optical and Other Properties I
O 80.1: Talk
Thursday, March 20, 2025, 10:30–10:45, H4
CISS in single heptahelicene molecules on Fe bilayers on W(110) — •Daniel E. Bürgler1, Mohammad Reza Safari1, Frank Matthes1, Karl-Heinz Ernst2, and Claus M. Schneider1 — 1Peter Grünberg Institut, Forschunschungszentrum Jülich, Germany — 2Empa, Swiss Federal Laboratories for Materials Science and Technology, 8600, Dübendorf, Switzerland
We reproduce and extend our single-molecule studies of CISS [1,2] to an alternative substrate system. Heptahelicene molecules are sublimed onto a multi-domain Fe bilayer film on W(110) instead of single-domain Co bilayer nanoislands on Cu(111). Using spin-polarized low-temperature scanning tunneling microscopy, the current flow through single (M)-enantiomers chemisorbed on neighboring and oppositely magnetized domains of the Fe bilayer film is mapped in the constant-height mode, where the tip is scanned at constant height above the Fe surface. The CISS magnetoresistance reaches up to 18% at 5 K and shows a strong dependence on the bias voltage. A comparison is drawn with the data obtained on Co nanoislands.
[1] M.R. Safari, F. Matthes, V. Caciuc, N. Atodiresei, C.M. Schneider, K.-H. Ernst, D.E. Bürgler. Adv. Mater. 36, 2308666 (2024)
[2] M.R. Safari, F. Matthes, C.M. Schneider, K.-H. Ernst, D.E. Bürgler, Small 20, 2308233 (2024)
Keywords: CISS; Scanning tunneling microscopy; Single-molecule experiment; Spin transport