Berlin 2008 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
MA: Fachverband Magnetismus
MA 18: Poster I : Bio Magn. (1-2); Mag.Imgaging (3-9); Magn. Semiconductors (10-16); Half Metals & Oxides (17-20); Coupl.Phenomena (21-27); Magn. Mat. (28-41); Micro & Nanostr. Magn. Materials (42-61); Micro Magn. (62-64); Surface Magnetism (65-70); Transport Phenomena (71-85)
MA 18.77: Poster
Dienstag, 26. Februar 2008, 15:15–18:30, Poster E
Magnetotransport measurements on epitaxial Fe nanostructures — •Markus Wahle1, Björn Wilke1, Saskia F. Fischer1, Ulrich Kunze1, Ellen Schuster2, Werner Keune2, Dirk Sprungmann3, and Kurt Westerholt3 — 1Werkstoffe und Nanoelektronik, Ruhr-Universität Bochum, D-44780 Bochum — 2Angewandte Physik, Universität Duisburg-Essen, D-47048 Duisburg — 3Institut für Experimentalphysik/Festkörperphysik, Ruhr-Universität Bochum, D-44780 Bochum
To investigate spin dependent transport in nanoscale ferromagnetic cross-junctions we performed temperature dependent (2 K to 300 K) non-local measurements. The examined structures consist of thin (≤ 50 nm) epitaxial Fe-films grown on intrinsic GaAs and capped by Cr. The growth and film quality has been controlled by means of RHEED images. Nanostructuring was done by e-beam lithography and subsequent Ar-ion etching. The widths of the cross-junctions vary from 200 to 500 nm. Non-local measurements constrain the observed area to the innermost part of the cross-junctions thus giving detailed information on magnetic switching processes/domain wall motion without the contribution of the leads towards resistance changes. Four different geometries of leads providing different domain structures and switching fields have been fabricated. We also present OOMMF simulations showing the switching behavior of such leads. The work is supported by the DFG within the SFB491.