Berlin 2012 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 35: Poster Session II (Polymeric biomolecular films; Nanostructures; Electronic structure; Spin-orbit interaction; Phase transitions; Surface chemical reactions; Heterogeneous catalysis; Particles and clusters; Surface magnetism; Electron and spin dynamics; Surface dynamics; Methods; Electronic structure theory; Functional molecules)

O 35.77: Poster

Dienstag, 27. März 2012, 18:15–21:45, Poster B

Magnetic and structural investigations of thin ferromagnetic CrSb layers on GaAs(110)/GaAs(001) — •Carsten Godde and Ulrich Köhler — Institut für Experimentalphysik IV, AG Oberfläche, Ruhr-Universität Bochum, Germany

Thin CrSb layers grow in the metastable zinc blende structure on III-V semiconductors and are predicted to be halfmetallic with a spin polarization of 100% at the Fermi-level. Thus, these systems are of great interest because of their possible use as spin aligning layers for spintronic devices. In this contribution we present structural and magnetic measurements of thin CrSb layers on the GaAs(110) and GaAs(001) surfaces for different coverages and annealing temperatures by STM and SQUID magnetometry. STM reveals for both surfaces a Volmer-Weber growth mode of the CrSb layers and atomic resolution show an ordering alongside the lattice structure of the substrate. Particularly with regard to the existence of different phases at the GaAs(001) surface, we investigate the influence of a Ga- and an As-terminated surface of the substrate for the film deposition. SQUID magnetometry measurements show ferromagnetic characteristics of the thin CrSb layers up to 4 ML thickness with a magnetic moment per Cr-atom of up to 5 µ_B.