Dresden 2011 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 36: Poster Session II (Metals; Nanostructures at surfaces; Surface or interface magnetism; Spin-Orbit Interaction at Surfaces; Electron and spin dynamics; Surface dynamics; Methods; Theory and computation of electronic structure)

O 36.89: Poster

Dienstag, 15. März 2011, 18:30–22:00, P4

The magnetic properties of Ni on modified Cu(110) surfaces — •Michael Hohage, Mariella Denk, Daniel Queteschiner, Richard Denk, and Peter Zeppenfeld — Institut für Experimentalphysik, Johannes Kepler Universität Linz, A-4040 Linz, Austria

The magnetism and morphology of thin Ni films deposited on Cu(110) surfaces reconstructed by exposure to oxygen and nitrogen has been studied. Both, oxygen and nitrogen act as a surfactant for the Ni growth, leading to smoother films. Scanning Tunneling Microscopy (STM), as well as Reflectance Difference Spectroscopy (RDS) is used to characterize the sample properties. The sensitivity of the RDS to the polar Magneto-Optic Kerr Effect has been exploited (RD-MOKE). Contrary to the growth on pristine Cu(110), thin Ni films on oxygen covered Cu(110)-(2x1)O show a spin reorientation transition (SRT) from in-plane to out-of-plane magnetization at 9 ML Ni coverage [1], [2]. Increasing the oxygen pre-coverage to form the Cu(110)-c(6x2)O reconstruction leads to a shift of the SRT to thicker Ni-films. However, Ni films grown on the Cu-CuO stripephase at lower oxygen pre-coverage only exhibit an SRT after post-growth exposure to oxygen. Ni films evaporated on the Cu(110)-(2x3)N do not show an SRT as long as no coadsorption of oxygen is permitted. The origin of the magnetic properties of these systems will be discussed and in particular the crucial role of the oxygen will be addressed.

[1] Th. Herrmann et al., Phys. Rev. B 73, 134408 (2006).

[2] R. Denk et al., Phys. Rev. B 79, 073407 (2009).