Dresden 2006 – scientific programme

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MA: Magnetismus

MA 15: Spin-Dependent Transport Phenomena II

MA 15.1: Talk

Tuesday, March 28, 2006, 10:15–10:30, HSZ 103

Domain wall resistance in (Co/Pt)_n-multilayer-nanowires — •C. Hassel, M. Brands, and G. Dumpich — Experimentalphysik, Universität Duisburg-Essen (Campus Duisburg), Lotharstr. 1, 47048 Duisburg

Nanostructured (Co/Pt)_n-multilayer-wires with perpendicular magnetic anisotropy are prepared by means of high resolution electron beam lithography (HR-EBL). Structural analysis of (Co/Pt)_n-multilayer-films yields a polycrystalline morphology with a mean grain size of 6 ± 2 nm. The magnetic properties of single (Co/Pt)_n-multilayer-nanowires are investigated by magnetic force microscopy. The implantation of Ga-ions (FIB) is used to locally modify the coercive field of the wires. These areas can subsequently be used as domain nucleation centres. The pinning of single domain walls is achieved by preparing (Co/Pt)_n-multilayer-wires on top of thin platinum wires in a three-step EBL-process and is verified by magnetic force microscopy investigations. Magnetoresistance measurements in perpendicular magnetic fields at room temperature clearly show a positive contribution of a single domain wall with a relative resistance increase of 1.8% inside a single domain wall.

This work is supported within SFB 491.