Berlin 2008 – scientific programme
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MA: Fachverband Magnetismus
MA 11: Spindependent Transportphenomena II
MA 11.4: Talk
Monday, February 25, 2008, 16:00–16:15, H 0112
In situ magnetoresistance measurements of FIB- milled nanoconstrictions — •Daniel Stickler1, André Kobs1, Genhua Pan2, and Hans Peter Oepen1 — 1Institut für Angewandte Physik, Universität Hamburg, Jungiusstr. 11, 20355 Hamburg, Germany — 2CRIST, Faculty of Technology, University of Plymouth, Plymouth, Devon PL4 8AA, UK
Several fundamentally and technologically interesting physical effects emerge when spin polarized currents in ferromagnets pass through a laterally confined domain wall. We perform in situ structuring and consecutive magnetoresistance measurements utilizing a micromanipulator in our UHV FIB/SEM dualbeam system. The flexibility of FIB structuring is used to carve microstructures, which exhibit different micromagnetic behaviour, into a thin 30nm permalloy film, capped with 3nm Pt. In CIP (current in plane) geometry, the magnetoresistance of a constriction connecting two elliptical microstructures is measured. The magnetic vortex structure in the two permalloy structures induces a domain wall in the constriction. In a sequence of measurements with the same film, the width of the constriction was varied from sub-20nm to 200nm. The size dependence of the magnetoresistance will be presented and discussed with respect to the field induced magnetic fine structure in the adjacent microstructures. Financial support by the EU via EU04-586 BMR is gratefully acknowledged.