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Regensburg 2016 – scientific programme

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O: Fachverband Oberflächenphysik

O 22: Organic-Inorganic Hybrid Systems and Organic Films

O 22.6: Poster

Monday, March 7, 2016, 18:15–20:30, Poster E

A molecular ruler for measuring the mesoscopic relaxations in Co/Au(111) interfaces — •Zheng Wei1,2, Jobynson Kollamana1, Benjamin Stadtmüller1, Mirko Cinchetti1, and Martin Aeschlimann11Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, Erwin-Schrödinger-Strasse 46, 67663 Kaiserslautern, Germany — 2College of Material Science and Engineering, Chongqing University, 400044 Chongqing, P. R. China

The contact between a molecular and ferromagnetic electrode contributes or even determines the performance of molecular spintronic devices. Here we report on scanning tunneling microscopy experiments on the C60/Co/Au(111) system. We observed a disorder-order molecular transition at evaluated temperature of 620K, independent of the cobalt thickness. However, the ordered molecular superstructures depend on the thickness of cobalt, reflecting the lattice dilatation in cobalt and inter-diffusion of Au. This means that C60 is a sensitive molecular ruler to measure the mesoscopic relaxation of cobalt films on Au(111) substrate. Furthermore, our results suggest an alternative way to tailor the perpendicular magnetic anisotropy of Co/Au(111) interfaces besides the coverage of C60 [1].

[1] K. Bairagi et al., Phys. Rev. Lett. 114, 247203 (2015).
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