Regensburg 2010 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 17: Spin Dynamics / Spin Torque II
MA 17.9: Vortrag
Mittwoch, 24. März 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.