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O: Fachverband Oberflächenphysik

O 31: Poster Session - Metal substrates: Structure, Epitaxy and Growth

O 31.8: Poster

Montag, 16. März 2020, 18:15–20:00, P1C

Comparative investigation of strain induced effects in Dy-Ag and Dy-Cu surface alloys — •Sina Mousavion, Johannes Seidel, Lu Lyu, Benjamin Stadtmüller, and Martin Aeschlimann — Department of Physics and Research Center OPTIMAS, Erwin Schroedinger Straße 46, 67663 Kaiserslautern, Germany

Intermetallic compound systems such as surface alloys offer the intriguing possibility to tailor the structural and electronic and ferromagnetic properties [1 ,2] in low dimensions. Here we focus on surface alloys formed between the lanthanide atoms and fcc(111) noble metal surfaces. These types of surface alloys are particularly interesting since their intermetallic structure is typically dominated complex Moiré pattern. We combine LEED and STM to determine the surface structure of two distinctive surface alloys: a Dy-Ag and a Dy-Cu surface alloy. Both reveal the formation of different incommensurate superstructures along with different Moiré patterns. We correlate these different Moiré patterns of to strain effects induced by the different lattice constant of the substrates. We propose that the surface strain in these surface alloys can have significantly influences of the magnetic order of lanthanide-noble metal surface alloys which has been reported for low sample temperature. [1] Nano Lett., 16, 4230-4235 (2016) [2] Phys. Rev. B 88, 125405 (2013)