Regensburg 2010 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 33: Poster II

MA 33.61: Poster

Freitag, 26. März 2010, 11:00–14:00, Poster B1

Depinning behaviours of domain walls at artificial notches in GMR nanostrips — •Björn Burkhardt¹, Sascha Glathe¹, Roland Mattheis¹, and Jeffrey McCord² — ¹IPHT Jena, Albert-Einstein-Str. 9, 07745 Jena — ²IFW Dresden, Helmholtzstr. 20, 01069 Dresden

Domain wall (dw) motion can be described by the Landau-Lifshitz-Gilbert equation. During the motion, the dw can be trapped in local energy minima. Such a local energy minimum can be created by an artificial notch. The pinning behaviour of a dw at the notch (30% in depth of the stripe width) was measured in long narrow nanostrips (width=500nm, length=30um) using the giant magneto resistance between a sense layer (NiFe - 10nm thick) and a reference layer (CoFe - part of an AAF/AF-combination). We examine the pinning process in dependence of a longitudinal and a transverse magnetic field. The depinning of the dw occurred under a specified longitudinal field. Below this critical field we found a reversible change of the resistance as a result of a dw, elongated in the longitudinal direction, which is still partly pinned at the pinning site. Decreasing the field to zero, the elongated dw relaxes to the starting configuration. This behaviour is analyzed by magneto-optical Kerr-measurements and confirmed by means of micro magnetic simulations.