Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 30: Surface Magnetism (joint session O/MA)

O 30.8: Vortrag

Dienstag, 2. April 2019, 12:15–12:30, H37

Effect of the Li doping on the Curie temperature of the GdAu2 surface alloy — •M. Ilyn1,2, M. Gobbi1,2, C. Rogero1,2, P. Gargiani3, M. Valbuena4, C. Moreno4, A. Mugarza4,5, and F. Schiller1,21Materials Physics Center CSIC-UPV-EHU — 2Donostia International Physics Center — 3ALBA Synchrotron — 4Catalan Institute of Nanoscience and Nanotechnology (ICN2) — 5ICREA Institució Catalana de Recerca i Estudis Avançats

Magnetic surface alloys REAu2 (where RE stands for the rare-earth elements) are the two-dimensional counterparts of the 3-D intermetallic compounds. They were found to be a model system to study the magnetic phenomena in 2-D metallic materials. Indeed, grown on the single-crystal substrates they have atomically-flat surface and a long-range crystallographic order, allowing for use of all standard surface science techniques. On the other hand, magnetic properties of this system can be tuned via choosing the RE element or a noble metal of the substrate.

In this talk I will present results that show the effect of Li doping on the magnetic properties of GdAu2 surface alloy. Previously we have seen that GdAu2 retains its magnetic properties when it is interfaced with organic layers and sustains a thermally activated dehalogenation reaction, but its Curie temperature (Tc) decreases. New XMCD measurements demonstrate a strong (by 60%) growth of the Tc in GdAu2 due to the evaporation of the submonolayer amount of Li. These data together with results of the XPS and ARPES measurements will be used to discuss the mechanism of the observed phenomena.

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