Dresden 2017 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 7: Electronic Structure of Surfaces: Magnetism and Spin Phenomena

O 7.9: Vortrag

Montag, 20. März 2017, 12:30–12:45, WIL C107

Electronic and magnetic properties of the GdAu2 surface alloy probed by SP-STM — •Maciej Bazarnik1, Emil Sierda1, Mikel Abadia2, Micha Elsebach1, Jens Brede2, and Ronald Wisendanger11Department of Physics, University of Hamburg, Jungiusstrasse 11, D-20355 Hamburg, Germany — 2Centro de Física de Materiale, P Manuel de Lardizabal 5, Donostia - San Sebastián, Gipuzkoa E-20018, Spain

In light of recent developments in spintronics it is essential to develop interfaces between magnetic materials and superconductors, topological insulators or organic structures. Tailoring magnetic properties of structurally robust and chemically inert systems is therefore of high importance. In this respect, there has recently been a lot of interest in novel kinds of systems such as intercalated graphene, h-BN, or thin oxide films. Lately a new class of 2D systems has been discovered that is very promising to fulfill all requirements, namely GdAu2 and GdAg2 surface alloys. Those systems are confined to one bilayer of the material grown on Au(111) or Ag(111) surface respectively. The 2D structure exhibits magnetic properties very different from its bulk counterpart, ie. while GdAu2 alloy is antiferromagnet in bulk it is in fact a ferromegnet as a 2D film. In this presentation we will focus on the GdAu2 surface alloy on Au(111) as examined by SP-STM. We will first address the local electronic and magnetic properties and compare our results to investigations by complementary surface science techniques. Then we will prove that the GdAu2 surface alloy acts as a catalyst for the on-surface Ullmann reaction.

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