Berlin 2012 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 52: Poster II - Magnetic Heusler compounds, Magnetic shape memory alloys, Thin Films, Micro-/Nano-structured magnetic materials, Graphene, Spins in organics, Magnetic imaging, Surface Magnetism, Spin excitations/Torque, Spincaloric transport

MA 52.57: Poster

Freitag, 30. März 2012, 11:00–14:00, Poster A

Spin caloric transport: Investigation of out-of-plane thermal gradient effects in thin film geometries — •Andreas Kehlberger, Enrique Vilanova Vidal, Gerhard Jakob, and Mathias Kläui — Johannes Gutenberg University of Mainz, Institute of Physics, Mainz

Spin caloric transport is expected to open new avenues towards low energy nanoscale spin sources. The measurement of the spin-Seebeck effect has drawn much attention to the research of thermally induced spin currents in thin film structures. In order to explain the observed amplification of signal due to the temperature of the environment, phonon enhancement of the spin caloric effect has been suggested. This magnon-phonon interaction calls for an understanding of the underlying effects of the thermal behavior of the used substrates in thin film experiments. Many thin film studies assume in-plane thermal gradients along the substrate neglecting perpendicular thermal gradients. We present studies of different measurement geometries revealing the importance of out-plane gradients, which can often not be avoided. These unexpected temperature differences lead to asymmetric thermally induced effects such as the anomalous Nernst effect, which have to be taken into account. Measurements of these effects are compared to measurements in a new optimized setup, which focuses on the minimization of the out-of-plane gradient to reveal the spin-Seebeck contribution to the signal. This work is supported by the DFG priority program SPP 1538 Spin Caloric Transport.