Berlin 2008 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 7: Micro and Nanostructured Magnetic Materials II

MA 7.10: Vortrag

Montag, 25. Februar 2008, 17:30–17:45, EB 301

Magnetoresistance in epitaxial Fe wires on GaAs(110) — •Christoph Hassel, Florian M. Römer, Jürgen Lindner, and Günter Dumpich — Fachbereich Physik and Center for Nanointegration (CeNIDE), Universität Duisburg-Essen, Lotharstrasse 1, 47048 Duisburg, Germany

From epitaxial Fe films grown on GaAs (110) wires of different widths are prepared using electron beam lithography and Ar sputtering. Before processing, the structural properties of the substrate and the Fe films are determined by AES, LEED and IV-LEED. For further processing, the films are capped with Ag and Pt to prevent oxidation of the Fe films under ambient conditions. The anisotropy constants of the capped films are quantified using ferromagnetic resonance. After preparing the wires, their magnetic properties are studied in a magnetic force microscope. These measurements confirm the epitaxial structure of the Fe wires. To investigate the magnetoresistance of the Fe nanowires, the wires are contacted by gold leads in a second EBL process. These measurements also clearly show the epitaxial structure of the wires. The magnetoresistance behaviour allows to determine anisotropy fields of the wires.
This work is financially supported within the SFB 491.