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TT: Fachverband Tiefe Temperaturen

TT 97: Spincaloric Transport I (organized by MA)

TT 97.3: Vortrag

Donnerstag, 3. April 2014, 17:15–17:30, HSZ 403

Magneto-thermopower and Magnetoresistance of single Co-Ni alloy Nanowires — •Tim Böhnert¹, Victor Vega², Ann-Kathrin Michel¹, Victor M. Prida², and Kornelius Nielsch¹ — ¹Universität Hamburg, Hamburg, Germany — ²Universidad de Oviedo, Oviedo, Spain

The magneto-thermopower is measured and correlated to the anisotropic magnetoresistance of Co-Ni alloyed nanowires with varying composition. The highest absolute and relative variation of the Seebeck coefficient in perpendicularly applied magnetic fields at room temperature are determined to be 1.5 µVK⁻¹ for Co_0.24Ni_0.76 and 8.1 % for Co_0.39Ni_0.61 nanowires. Power factors of 3.7 mW/mK² have been achieved, which is competitive with common thermoelectric materials like Bi₂Te₃. For Co-Ni nanowires containing up to 39 % Co a linear relationship between the magnetic field dependent change of the Seebeck coefficient and the electrical conductivity is found.