Regensburg 2010 – scientific programme
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MA: Fachverband Magnetismus
MA 33: Poster II
MA 33.23: Poster
Friday, March 26, 2010, 11:00–14:00, Poster B1
Structural, electrical and magnetic properties of single Au-Ni/NiO-Au nanowires — •Corinna Steinweg1, René Sewcz1, Sabrina Baldus1, Saskia F. Fischer1, Mihaela Daub2, and Kornelius Nielsch3 — 1Werkstoffe und Nanoelektronik, Ruhr-Universität Bochum, Germany — 2Max-Planck-Institut für Mikrostrukturphysik, Halle, Germany — 3Multifunctional Nanostructures, Universität Hamburg, Germany
Ferromagnetic metallic nanowires are of high interest for magnetic sensing and storage applications. However, due to surface oxidation of the nanowires electrical contacts easily lead to high-contact resistances of a few kΩ. Here, we present multisegmented Au-Ni(NiO)-Au nanowires with a direct Au-Ni interface. Individual nanowires were laterally contacted in a four-terminal geometry via optical lithography, electron-beam lithography, thermal evaporation and lift-off patterning. The nanowires exhibit low-ohmic contacts of about 20 Ω. The resistivity decreases with the temperature (300 K to 4.2 K) and is in the order of that of high-purity bulk nickel [1]. The longitudinal anisotropic magnetoresistance (AMR) is about 1.5 % at 80 K and decreases with higher temperatures, 0.5 % at 300 K. The coercive field and the AMR are investigated for different angles between the current and magnetic field.
[1] T. FARRELL et al. J. PHYS. c (PROC. PHYS. SOC), ser. 2, 1359 (1968)