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Regensburg 2010 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 10: Poster I

MA 10.44: Poster

Dienstag, 23. März 2010, 10:45–13:45, Poster A

Magnetic and structural investigations of iron based nanostructures and thin CrSb layers on GaAs(110) — •Carsten Godde, Sani Noor, Atena Rastgoo Lahrood, Gregor Nowak, Hartmut Zabel, and Ulrich Köhler — Institut für Experimentalphysik IV, Ruhr-Universität Bochum, Germany

In this contribution we present structural and magnetic measurements of the two different systems, Fe and CrSb layers on the GaAs(110) surfaces.
We investigate the growth of Fe on the GaAs(110) surface at different coverages and annealing temperatures by STM and MOKE and show that the structure remains ferromagnetic up to 500C in combination with lateral structuring on the nanometer scale. These nanostructures consist exclusively of roof-shaped 3D-islands elongated along the [110]-direction of the GaAs(110) substrate. An intermixing of the Fe film and the substrate material induced by the annealing step leads to a ternary alloy Fe3Ga2−xAsx which is confirmed by X-ray diffraction measurements. Despite of this alloying it should be noted that the magnetic measurements of the nanostructures still show ferromagnetic characteristics.
Thin CrSb layers grow in the zinc blende structure and contrary to the Fe system they keep their ferromagnetic properties and structural stability up to very high annealing temperatures which is interesting for enabling better crystalline quality. In this context the CrSb layers were characterised by STM, LEED and SQUID magnetometry at different coverages and annealing temperatures.


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