Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 99: Focus Session: Spins on Surfaces III (joint session O/MA)

O 99.3: Vortrag

Freitag, 5. April 2019, 11:15–11:30, H24

Revealing spin states in Co-salophene chains grown on GdAu₂ — •Maciej Bazarnik^1,2, Micha Elsebach¹, Emil Sierda^1,2, Maxim Ilyn³, Jan Dreiser⁴, Jens Brede³, and Roland Wiesendanger¹ — ¹Department of Physics, University of Hamburg, Jungiusstrasse 11, D-20355 Hamburg, Germany — ²Institute of Physics, Poznan University of Technology, Piotrowo 3, 60-965 Poznan, Poland — ³Centro de Física de Materiales, P^∘ Manuel de Lardizabal 5, Donostia - San Sebastián, E-20018 Spain — ⁴Swiss Light Source, Paul Scherrer Institut (PSI), CH-5232 Villigen, Switzerland

Lately, a polymerization of well-aligned organic nanowires was presented on a magnetic GdAu₂ surface alloy [1]. Apart from growing graphene on, i.e., a Ni surface, this was the first successful approach to a surface catalyzed reaction on a magnetic substrate. Such a ferromagnetic substrate in combination with magnetic molecules offers a very interesting interface for spintronic applications.

Here, we will present the growth behaviour of Co-salophene oligomers on the GdAu₂ surface alloy prepared on a Au(111) substrate. By combining spin-polarized scanning tunneling microscopy and X-ray magnetic circular dichroism we have revealed the evolution of the spin-* state residing on the Co-centers of the salophene molecules upon adsorption and thermally activated Ullmann coupling.

[1] M. Abadia et al. ACS Nano, 2017, 11 (12), pp 12392-12401