Regensburg 2022 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 30: Surface Magnetism
MA 30.4: Vortrag
Donnerstag, 8. September 2022, 10:15–10:30, H48
Real-time MOKE measurements of CoTMPP on magnetic Ni/Cu(110)-(2x1)O — •Gizem Mendirek1, Aleksander Brozyniak2, Michael Hohage1, Andrea Navarro-Quezada1, and Peter Zeppenfeld1 — 1Institute of Experimental Physics, Johannes Kepler University Linz, Altenberger Str. 69, 4040 Linz, Austria — 2Christian Doppler Laboratory for Nanoscale Phase Transformations, Johannes Kepler University Linz, Altenberger Str. 69, 4040 Linz, Austria
In this work, we report the detailed analysis employing a fitting algorithm on a setup consisting of a combination of a sinusoidal modulation of the magnetic field with the synchronous detection of the reflectance difference spectroscopic MOKE (RD-MOKE) signal. This setup allows recording hysteresis loops continuously revealing relevant magnetic properties like magnetization amplitude, remanent magnetic signal and coercive field as a function of coverage, time or temperature with high precision in real-time. The capabilities of our setup and our analysis algorithm is demonstrated for Ni thin films grown on a Cu(110)-(2×1)O reconstructed surface with a sharp spin reorientation transition at 9 ML. Subsequently, the deposition of cobalt tetramethoxyphenylporphyrin (CoTMPP) thin films on the Ni/Cu(110)-(2×1)O system is investigated. The adsorption of the molecules induces characteristic changes in the magnetic properties such as the decrease of the Curie temperature of the Ni thin films upon CoTMPP deposition with different thicknesses.