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O: Fachverband Oberflächenphysik
O 25: Poster Session II: Surface magnetism II
O 25.1: Poster
Monday, March 1, 2021, 13:30–15:30, P
Real-time MOKE measurements of CoTMPP on magnetic Ni/Cu(110)-(2x1)O — •Gizem Mendirek1, Aleksander Brozyniak2, Michael Hohage1, Andrea Navarro-Quezeda1,3, and Peter Zeppenfeld1 — 1Institut für Experimentalphysik, Johannes Kepler Universität Linz, Altenberger Str. 69, 4040 Linz, Österreich — 2CD-Labor für Nanoskalige Phasenumwandlungen, Johannes Kepler Universität Linz, Altenberger Str. 69, 4040 Linz, Österreich — 3Institut für Halbleiter und Festkörperphysik, Johannes Kepler Universität Linz, Altenberger Str. 69, 4040 Linz, Österreich
In this work, we report real-time investigations of an organic/ferromagnetic interface by employing a sinusoidal modulation of the magnetic field with the synchronous detection of the Reflectance Difference Magneto-Optical Kerr Effect (RDMOKE) signal. Besides improving the detection limit to variations of the Kerr rotation angle below 1 μrad/mT, the present setup allows recording hysteresis loops continuously as a function of coverage, time or temperature. We illustrate the capabilities of the setup for Ni thin films grown on a Cu(110)-(2x1)O surface and the subsequent deposition of cobalt tetramethoxyphenylporphyrin (CoTMPP) thin layers. The adsorption of the molecules induces characteristic changes in the magnetic properties (magnetization amplitude, remanence and coercive field) that are monitored as a function of the coverage with sub-monolayer resolution and as a function of temperature, revealing the decrease of the Curie temperature upon CoTMPP deposition on Ni films with different thicknesses.