Dresden 2009 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 37: Spin Dependent Transport Phenomena
MA 37.10: Vortrag
Donnerstag, 26. März 2009, 17:45–18:00, HSZ 403
Magnetoresistance of iron thin films on facetted Al2O3-substrates — •Sebastian Mooser and Martin Jourdan — Institut für Physik, Johannes Gutenberg-Universität Mainz, Germany
Al2O3(100) substrates are annealed at high temperatures in air which results in a facetted surface. A layer of iron is deposited via molecular beam epitaxy. The deposition temperature, the thickness, the angle of the beam respective to the sides of the facets as well as the annealing process after the deposition are varied. The shape of the facets is analysed via in-situ STM and ex-situ AFM after Al-capping, respectively. The growth of iron on facetted Al2O3 is analysed via four-circle-diffractometry. Finally, the resistance depending on the applied magnetic field is measured at different temperatures. A change in resistance up to 0.5% has been achieved yet. A possible morphological origin of the observed magnetoresistance is proposed. Small iron grains building sorts of nano-wires give rise to the resistance being dependent on the applied magnetic field.