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O: Oberflächenphysik

O 39: Nanostructures III

O 39.3: Vortrag

Donnerstag, 30. März 2006, 15:30–15:45, PHY C213

Spin-resolved STM measurements of Co nanostructures on Pt(111) — •Focko Meier, Kirsten von Bergmann, Jens Wiebe, Matthias Bode, and Roland Wiesendanger — Institute of Applied Physics, Hamburg University, D-20355 Hamburg, Germany

The Co/Pt(111) sample system has been studied quite intensively in the past to investigate fundamental magnetic properties: using spatially-averaging optical techniques the direction and magnitude of the anisotropy of 2-dimensional Co nanostructures, chains at step edges and single atoms on Pt(111) have been probed.[1] We performed spin-resolved scanning tunneling microscopy measurements on Co nano-structures on Pt(111) to gain further insight into the electronic and magnetic properties of this system. The measurements were done in a LT-UHV-STM system below 13 K. Using magnetically sensitive tips (Fe- or Cr-coated W tips) we measured the electronic structure of ML and DL high Co with spatial and spin resolution to get access to the energy dependence of the spin polarization. Additionally we probed the response of Co nanostructures to an external magnetic field. The spatial resolution reveals the different switching mechanisms of multi-domain Co-nanowires and single-domain Co islands.

[1] Rusponi et al. nature materials, Vol 2, p546, 2003; Gambardella et al. Nature, Vol 416, p301, 2002; Science, Vol 300, p1130, 2003