Dresden 2011 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 43: Micro- and Nanostructured Magnetic Materials IV
MA 43.4: Vortrag
Mittwoch, 16. März 2011, 17:45–18:00, HSZ 103
Magnetoresistance and thermopower measurements of an individual ferromagnetic metallic nanowire — •Corinna Steinweg1,2, Harald Austenfeld1, Saskia F. Fischer2, William Töllner3, and Kornelius Nielsch3 — 1Werkstoffe und Nanoelektronik, Ruhr-Universität Bochum, 44780 Bochum, Germany — 2Novel Materials, Humboldt-Universität zu Berlin, 12489 Berlin, Germany — 3Multifunctional Nanostructures, Universität Hamburg, 20355 Hamburg, Germany
We investigate individual Au-Ni/NiO-Au nanowires to determine magnetotransport properties and the thermopower. The electrochemically deposited Ni nanowire has in situ deposited Au endings to enable low-ohmic contacts. The nanowire is placed on a Si/SiO2 substrate, and the contacts are structured by optical lithography, metal evaporation and a lift off process. The measured resistivity of 7.46 μΩcm of the nanowire is significantly lower than that measured for nanowires with contacts made by electro thermal annealing [1]. The temperature-dependence of the anisotropic magnetoresistance yields switching fields which are in agreement with predictions by the curling mode magnetization reversal of an infinite cylinder [2]. With an additional heating wire we achieve a temperature difference of 1.2 K at 300 K along the ends of the wire. We measure a voltage drop at the ends of the wire as a function of the heating power, e.g., 2.84 μV at 12 mW.
[1] E. Shapira, et al., Nanotechnology 18, 485703 (2007). [2] W. Wenrsdorfer, et al., Phys. Rev. Lett. 77, 9 (1996).