Dresden 2009 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 25: Micro- and Nanostructured Magnetic Materials II

MA 25.16: Vortrag

Mittwoch, 25. März 2009, 18:45–19:00, HSZ 403

High resolution in-situ MOKE and STM setup with all optical components in UHV — •Anne Lehnert, Philipp Buluschek, Nicolas Weiss, Johannes Giesecke, Matthias Treier, Stefano Rusponi, and Harald Brune — Institute of the Physics of Nanostructures, EPF-Lausanne, Switzerland

A surface magneto-optic Kerr effect (MOKE) setup fully integrated in an ultra high vacuum chamber is presented [1]. The system has been designed to combine high resolution in-situ MOKE and variable temperature scanning tunnelling microscopy. The coverage detection limit is 0.5 ML for transverse MOKE and 0.1 ML for polar MOKE. For island superlattices, the latter limit corresponds to islands composed of about 50 atoms. Magnetic fields up to 0.3 T can be applied at any angle in the transverse plane allowing the study of the in-plane and out-of-plane magnetization. The setup performance is demonstrated for a continuous film of 0.9 ML Co/Rh(111) with in-plane easy axis and for a superlattice of nanometric double layer Co islands on Au(11,12,12) with out-of-plane easy axis. For Co/Au(11,12,12) we demonstrate that the magnetic anisotropy energies (MAE) deduced from thermally induced magnetization reversal by measuring the zero field susceptibility and from applying a torque onto the magnetization by turning the field are the same. Assuming the MAE to be proportional to the perimeter length 0.95± 0.01 meV/perimeter atom and 0.87± 0.01 meV/perimeter atom have been inferred.

[1] A. Lehnert et al., submitted to Rev. Sci. Instrum.