Dresden 2009 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 40: Poster II: Bio- and Molecular Magnetism (1-9); Magnetic Coupling Phenomena/Exchange Bias (10-15); Magnetic Particlicles and Clusters (16-29); Micro and Nanostructured Magnetic Materials (30-51); Multiferroics (52-64); Spin Injection in Heterostructures (65-67); Spin-Dyn./Spin-Torque (68-93); Spindependent Transport (94-108)

MA 40.32: Poster

Freitag, 27. März 2009, 11:00–14:00, P1A

Weak electron localization and enhanced electron electron interaction in epitaxial Fe wires on GaAs(110) — •Christoph Hassel, Florian M. Römer, Günter Dumpich, and Jürgen Lindner — Fachbereich Physik, AG Farle, CeNIDE, Universität Duisburg-Essen, 47048 Duisburg, Germany

Epitaxial Fe films are prepared on GaAs(110) substrates. Structural investigations of these films are carried out using LEED and IV-LEED. After capping the Fe-films with Ag and Pt to prevent an oxidation, we determined the anisotropy constants of the Fe films using ferromagnetic resonance (FMR) and SQUID. The films are subsequently structured into wires using electron-beam lithography and Ar-ion beam etching. Fe wires in the range of 100 to 3000 nm are studied. Due to the interplay of uniaxial and fourfold anisotropy of Fe/GaAs(110), it is possible to structure the wires, so that the effective easy axis of magnetization is transversal to the long wire axis [1]. This is proven by magnetic force microscopy, magnetoresistance and by micromagnetic simulations using the OOMMF code. By varying the widths of the wires and thus the shape anisotropy, one can change this effective easy axis of magnetization. We measured the low temperature magnetoresistance behaviour of these wires in order to find contributions of the weak electron localization. However, our results can be quantitatively explained in the framework of enhanced electron-electron interaction and no effect of weak electron localization was found.

[1] C. Hassel, F. M. Römer, R. Meckenstock, G. Dumpich, and J. Lindner, Phys. Rev. B 77, 224439 (2008)