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Berlin 2015 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 108: Spin-Dependent Transport Phenomena II (organized by MA)

TT 108.11: Talk

Thursday, March 19, 2015, 17:45–18:00, H 0112

Tunable Thermoelectric Power Factors of Magnetoresistive Nanowires — •Anna Niemann1, Tim Böhnert1, Ann-Kathrin Michel1, Svenja Bäßler1, Johannes Gooth1, Bence G. Tóth2, Katalin Neuróhr2, László Péter2, Imre Bakonyi2, Victor Vega3, Victor M. Prida3, and Kornelius Nielsch11Universität Hamburg, Hamburg, Germany — 2Hungarian Academy of Sciences, Budapest, Hungary — 3Universidad de Oviedo, Oviedo, Spain

We present spin-caloric transport in single Co-Ni alloy and multilayered Co-Ni/Cu nanowires, including magnetoresistance (MR) and magneto-thermopower (MTP) measurements. Co-Ni alloy nanowires show anisotropic MR while multilayered nanowires show predominant giant MR. MTP and MR are studied in a temperature range between 50 K and 325 K leading to effect sizes up to 6 % for Co-Ni alloy samples and up to 15 % for multilayered samples at room temperature. While the thermopower describes a material’s ability to convert temperature gradients into electrical voltage, thermoelectric power factors (PFs) give a measure of the electrical power generated from thermoelectric effects. The PFs of our nanowires can compete with common thermoelectric bulk materials like Bi2Te3. Additionally, a magnetic field-dependence of the nanowires’ PFs can be observed. PFs of Co-Ni nanowires increase by 24 % in an external magnetic field, while PFs of multilayered nanowires can be increased by up to 40 %. This magnetic field dependence opens interesting opportunities to tune electrical power output according to applicational needs.

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