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Dresden 2017 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 20: Bio- and Molecular Magnetism

MA 20.7: Vortrag

Dienstag, 21. März 2017, 11:15–11:30, HSZ 301

Magnetic properties of EuCot nanowires on graphene/Ir(111) — •Nico Rothenbach1, Felix Huttmann2, Katharina Ollefs1, Stefan Kraus2, Matthias Bernien3, Lucas M. Arruda3, Fabian Nickel3, Andrew J. Britton3, Wolfgang Kuch3, Thomas Michely2, and Heiko Wende11University of Duisburg-Essen and CENIDE — 2University of Cologne — 3Freie Universität Berlin

Magnetic coupling and the magnetic anisotropy of localized 4f magnetic moments connected via organic ligands in molecular networks are a highly topical field of research owing to potential applications in organic spintronics [1-3]. We investigated organometallic sandwich-molecular nanowires of europium-cyclooctatetraene (EuCot) on graphene/Ir(111) by means of x-ray magnetic circular dichroism (XMCD) down to 2.5 K. Using temperature-, angular-, and field-dependent europium M4,5-edge XMCD measurements we studied two different coverages, namely 0.5 and 2.0 monolayers (ML) of EuCot. The comparison of the XMCD spectra of the submonolayer EuCot sample with the multilayer sample shows pronounced differences, resulting in different orbital moments. Furthermore, for the submonolayer coverage we determine a clearly different functional behavior of the field-dependent XMCD data for normal and grazing x-ray incidence, whereas no anisotropic behavior is found for the 2.0-ML sample.

[1] P. Gambardella et al., Nature Materials 8, 189 (2009)

[2] A. Lodi Rizzini et al., Surface Science 630, 361 (2014)

[3] Y. Lan et al., J. Mater. Chem. C 3, 9794 (2015)

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