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Regensburg 2010 – scientific programme

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MA: Fachverband Magnetismus

MA 17: Spin Dynamics / Spin Torque II

MA 17.9: Talk

Wednesday, March 24, 2010, 16:30–16:45, H10

Different Walker fields in the same nanostripe: The influence of slanted edges on the domain wall dynamics — •Sascha Glathe, Matthias Zeisberger, and Roland Mattheis — IPHT Jena, Albert-Einstein-Str. 9, 07745 Jena

The Walker field is the key parameter describing field driven domain wall (DW) dynamics. We analyzed the Walker field in giant magnetoresistance (GMR) nanostripes by means of time resolved resistance measurements. With this technique we are able to determine the Walker field strength directly by evaluating the obtained single shot measurements. The 160*45*45000 nm3 (sense layer thickness was 20 nm) GMR nanostripe was deposited by dc magnetron sputtering and structured via photolithography and Ar ion etching under tilt. Therefore the nanostripes have slanted edges in the cross section. This geometrical feature breaks the symmetry between a moving head-to-head and a tail-to-tail DW, respectively, giving rise to different Walker field strengths in the same sample. This difference is explained by means of the different stray field contribution appearing for both configurations and is confirmed by micromagnetic simulations.

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