Berlin 2015 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 44: Surface Magnetism (Joint Session with O) - Adatoms on surfaces
MA 44.4: Vortrag
Donnerstag, 19. März 2015, 15:45–16:00, H 0110
Magnetic properties of Cobalt nanodot arrays on rare-earth-Au2 surface compounds — •Frederik Schiller1,2, Laura Fernández2,3, Maxim Ilyn1, Ana Magaña4, and Enrique Ortega4 — 1Centro de Física de Materiales, San Sebastian, Spain — 2Fachbereich Physik, Phillips Universität Marburg, Germany — 3Donostia International Physics Center, San Sebastian, Spain — 4Universidad del País Vasco (UPV/EHU), San Sebastian,Spain
Cobalt deposition on prepatterned rare-earth (RE)Au2/Au(111) substrates leads to self-organization into very dense hexagonal structures of Co nanodots. Depending on the substrate surface RE material one can achieve different interactions that determine the magnetic properties of the dots. In order to investigate in detail such effects, a combined study involving X-ray Circular Magnetic Dichroism and Scanning Tunneling Microscopy will be presented. Several substrates will be analyzed (SmAu2, GdAu2, and YbAu2) that have the same RE-Au2 surface structure and lattice but reveal ferromagnetic, anti-ferromagnetic [1], and non-magnetic interaction with the Co nanodot array, respectively. These interactions not only determine the magnetic properties below the Curie temperature TC of the substrate but also far above TC and lead to enhancements of the magnetic anisotropy and blocking temperature of the Co nanodot array.
[1] L.Fernandez et al., Nano Letters 14, 2977 (2014).