Dresden 2014 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 55: Poster II
MA 55.16: Poster
Freitag, 4. April 2014, 10:30–13:30, P2
Thermoelectrical effects and magnetic anisotropy in GaMnAs thin films — •Ivan Soldatov1, Nadezda Panarina1, Rudolf Schäfer1,2, Christian Hess1, Sibylle Meyer2, Wolfgang Limmer3, Wladimir Schoch3, and Ludwig Schultz1,2 — 1IFW-Dresden, Institute for Solid State Research, D-01171 Dresden, Germany — 2Institute for Materials Science, TU Dresden, Mommsenstraße 9, D-01069 Dresden, Germany — 3Universität Ulm, D-89081 Ulm, Germany
We performed a comprehensive investigation of thermoelectric (with temperature gradient) and galvanomagnetic (with charge current) effects in magnetic thin films, where the spin Seebeck effect was observed. Thermoelectric measurements were performed using the steady-state technique, The transverse electric signal on the deposited Pt strips (transverse spin Seebeck configuration) was registrated. Signal was registered directly on the GaMnAs. It suggests planar Nernst (PNE), as an origin of the magneto-electric effects observed in the thin ferromagnetic film of GaMnAs. Besides PNE we measured the anomalous Nernst effect (ANE), applying out-of-plane temperature gradient. From those data the anomalous Nernst coefficient was calculated to be not greater then 500*V/K in saturation. The planar Hall effect (PHE) measured in the sample provided us an opportunity to determine the directions of easy axes and temperature dependence of the ratio between the cubic and uniaxial anisotropies in the system. These data are in agreement with conclusions made from observation of the domain structure of the magnetic layer with use of Kerr-microscopy.