Berlin 2015 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 20: POSTER Ib
MA 20.25: Poster
Dienstag, 17. März 2015, 09:30–13:00, Poster A
Linear and quadratic Nernst effects in a CoFeTb thin film — •Tristan Matalla-Wagner1, Daniel Meier1, Zoe Kugler1, Jaroslav Hamrle2, Günter Reiss1, and Timo Kuschel1 — 1CSMD, Physics Department, Bielefeld University, Germany — 2VSB - Technical University of Ostrava, Czech Republic
Nernst effects describe the generation of charge voltages driven by temperature gradients and can occur as side effects in spin Seebeck experiments [1,2]. We investigated the angle dependence of Nernst voltages for various external magnetic field directions on a 30 nm thick Cobalt-Iron-Terbium alloy thin film. We further separated the measured curves into antisymmetric and symmetric parts with respect to the external magnetic field. This method can be used to identify effects which have linear or quadratic dependencies with respect to either the magnetization of the sample or the external magnetic field, such as the linear and quadratic Nernst effect (LNE/QNE).
This method was already used by Meier et al. [3] to separate the anomalous from the planar Nernst effect of a permalloy sample with a platinum strip on it.
The separation method combined with the angle dependence is used to investigate the contribution of LNE and QNE to the total Nernst voltage. Furthermore, we discuss how a misalignment of the effective direction of the temperature gradient affects the LNE and the QNE.
D. Meier et al., Phys. Rev. B 87, 054421 (2013)
M. Schmid et al., Phys. Rev. Lett. 111, 187201 (2013)
D. Meier et al., Phys. Rev. B 88, 184425 (2013)