Dresden 2020 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 110: Surface Magnetism I (joint session O/MA)

O 110.4: Vortrag

Donnerstag, 19. März 2020, 15:45–16:00, WIL A317

Real-time susceptibility measurements of CoTMPP on magnetic Ni/Cu(110)-(2x1)O thin films — •Gizem Mendirek1, Aleksander Brozyniak1, Michael Hohage1, Mariella Denk1, Andrea Navarro-Quezada1,2, and Peter Zeppenfeld11Institut für Experimentalphysik, Johannes Kepler Universität Linz, Altenberger Str. 69, 4040 Linz, Österreich — 2Institut für Halbleiter und Festkörperphysik, Johannes Kepler Universität Linz, Altenberger Str. 69, 4040 Linz, Österreich

The magneto-optic signal of organic molecular thin films is expected to be rather small. Therefore, a high sensitivity is required to measure the magnetic susceptibility of thin molecular layers. In this work we present the implementation of a sinusoidal modulation of the magnetic field to a Reflectance Difference Magneto-Optical Kerr Effect (RD-MOKE) setup with increased sensitivity that allows detecting of variations of the Kerr rotation angle below 1 µrad/mT at applied fields of a few mT. We illustrate the capabilities of the setup for Ni thin films grown on Cu(110)-(2x1)O surfaces, which exhibit a sharp spin reorientation transition (SRT) of the magnetic easy axis from in-plane to out-of-plane at a coverage of 9 ML. Subsequent deposition of cobalt tetramethoxyphenylporphyrin (CoTMPP) on Ni/Cu(110)-(2x1)O surface induces characteristic changes in the magnetic properties that can be monitored in real-time during the growth of the organic layer. Our results demonstrate the potential of the setup for studying ultrathin organic/ferromagnetic interfaces.

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