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DS: Fachverband Dünne Schichten

DS 4: Poster

DS 4.5: Poster

Dienstag, 28. September 2021, 10:00–13:00, P

Novel 2D surface alloys on Pt(111): electronic and structural properties — •Marta Przychodnia¹, Tomasz Grzela¹, Roland Wiesendanger², and Maciej Bazarnik^1,2 — ¹Institute of Physics, Poznan University of Technology, Poznan, Poland — ²Department of Physics, Hamburg University, Hamburg, Germany

Lately, a new class of 2D magnetic films has been discovered, namely rare earth (RE) metals - transition metals (TM) surface alloys. Limiting the dimensionality of RE-TM alloys to 2D (so-called surface alloys) influences their properties in surprising ways. For example, a GdAu₂ and GdAg₂ surface alloys are ferromagnetic while in bulk they are antiferromagnetic. Small change of Au to Ag in this system raise the Curie temperature from 19^∘C to 85^∘C showing potential for tuneability.

Here, I will present the comparison study of Dy-Pt and Gd-Pt mono- and double-layers of surface alloys grown on Pt(111). Structural and electronic properties in atomic scale of both systems were investigated using scanning tunneling microscopy (STM) and spectroscopy (STS).