Dresden 2014 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 85: Spincaloric Transport II (organized by MA)
TT 85.10: Vortrag
Donnerstag, 3. April 2014, 12:00–12:15, HSZ 04
Influence of heat flow directions on Nernst effects in Py/Pt bilayers — •Daniel Meier1, Daniel Reinhardt1, Maximilian Schmid2, Christian H. Back2, Jan-Michael Schmalhorst1, Timo Kuschel1, and Günter Reiss1 — 1University of Bielefeld, D-33501 Germany — 2University of Regensburg, D-93040 Germany
We investigated the voltages obtained in a thin Pt strip on a Permalloy film which was subject to in-plane temperature gradients and magnetic fields. The voltages detected by thin W-tips or bond wires showed a purely symmetric effect with respect to the external magnetic field which can be fully explained by the planar Nernst effect (PNE). To verify the influence of the contacts measurements in vacuum and atmosphere were compared and gave similar results. We explain that a slightly in-plane tilted temperature gradient only shifts the field direction dependence but does not cancel out the observed effects. Additionally, the anomalous Nernst effect (ANE) could be induced by using thick Au-tips which generated a heat current perpendicular to the sample plane. The effect can be manipulated by varying the temperature of the Au-tips. These measurements are discussed concerning their relevance in transverse spin Seebeck effect measurements.