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MA: Fachverband Magnetismus

MA 28: Magnetic Thin Films III

MA 28.9: Vortrag

Donnerstag, 28. Februar 2008, 16:30–16:45, H 1012

Transition from TMR to AMR in ultrathin magnetic films — •Alexander von Schmidsfeld, Stephen Krzyk, Mathias Kläui, and Ulrich Rüdiger — Fachbereich Physik, Universität Konstanz, 78457 Konstanz

We report on the transition from tunneling magnetoresistance (TMR) to anisotropic magnetoresistance (AMR) in ultrathin magnetic films grown on insulating substrates at low temperature. In situ magnetotransport measurements were carried out in a UHV MBE chamber during film growth. The magnetotransport characteristics changed from a TMR regime towards AMR with increasing film thickness. This transition occurs at thicknesses of several monolayers, indicating island growth. By further increasing the fim thickness above 10 ML, AMR dominates, indicating a transition from islands to a continuous film. This transition zone around the percolation threshold was investigated with high thickness resolution for different materials.