Regensburg 2010 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 28: Surface or interface magnetism

O 28.3: Vortrag

Dienstag, 23. März 2010, 11:00–11:15, H48

Range of spin-polarization on the (111) surface of platinum induced by the proximity of cobalt stripes — •Focko Meier, Lihui Zhou, Jens Wiebe, and Roland Wiesendanger — Institute of Applied Physics, Hamburg University, Germany

The properties of magnetic nanostructures supported by metallic substrates are strongly governed by the electronic interaction between nanostructure atoms and substrate atoms. For the model system of Co impurities dissolved in Pt it is well known that these interactions lead to induced magnetic moments in the neighbouring Pt atoms forming a so called giant moment systems [1]. Furthermore it has been revealed that Pt conduction electrons mediate an RKKY exchange interaction between localized magnetic moments which relies on a spatially oscillating spin-polarization [2]. However it is yet unclear how these two effects interfere. By applying spin-resolved scanning tunnelling spectroscopy at 0.3 K we investigated how the polarization of Pt is influenced in the vicinity of Co stripes on a Pt(111) surface. Our results show that the Pt density of states near the Fermi energy shows a response to the magnetic orientation of the Co stripe. Interestingly this response can be observed for distances larger than 1 nm from the stripe where the RKKY interaction is already antiferromagnetic.

[1] Graham and Schreiber, PRL 17, 650 (1966) [2] Meier et al., Science 320, 82 (2008)