Regensburg 2010 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 33: Poster II

MA 33.22: Poster

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

Magnetic and thermoelectrical measurement of multi-segmented Co/Cu nanowires — •Bastian Lie, Tim Böhnert, Johannes Kimling, and Kornelius Nielsch — Institut für Angewandte Physik, Universität Hamburg, Hamburg, Germany

Nanostructures, e.g. modulated nanowires, reveal quantum effects due to their size which are advantageous for thermoelectrical applications. The thermoelectric properties depend on phonon- and electron-scattering in a material. We prepared high aspect-ratio multisegmented cobalt/copper nanowires and measured the thermal conductivity and the giant magnetoresistance (GMR). The desired approach for the preparation is the bottom-up method. In our case the single-bath-electrodepostion of cobalt and copper in eloxated alumina templates is applied by means of galvanostatic and potentiostatic deposition to fabricate alternating segments with a thickness of several nm’s. The thickness of the copper layer is varied to validate the oscillation of the GMR-ratio dependant on the spin diffusion length. We will present details of the sample processing, magnetoresistance measurements and 3ω-measurements.