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MA: Fachverband Magnetismus

MA 30: Spin-Dynamics / Spin-Torque III

MA 30.6: Talk

Thursday, March 26, 2009, 11:30–11:45, HSZ 04

Correlation between the pinning behavior of domain walls (dw) and the edge roughness of etched GMR nanostrips — •Sascha Glathe, Marco Diegel, and Roland Mattheis — IPHT Jena, Albert-Einstein-Str. 9, 07745 Jena

During dw motion in nanostrips a dw samples the energy landscape, caused for example by edge roughness. As a result the dw can be pinned at local energy minima. The pinning and depinning process of dw in long GMR nanostrips (width = 160 nm, length = 200 000 nm) was examined using time resolved resistance measurements. We found many small fluctuation of the potential giving rise to weak dw pinning with thermally activated depinning. However there are some large pinning sites acting as deep potential wells for the dw. To get further inside in the pinning mechanism at these potential wells we examined the influence of a transversal field on the depinning fields and pinning probability and found significant dependencies.