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Regensburg 2013 – scientific programme

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MA: Fachverband Magnetismus

MA 50: Poster II

MA 50.69: Poster

Friday, March 15, 2013, 10:30–13:30, Poster D

Nernst vs. spin-Seebeck effects in Py thin films — •M. Schmid1, S. Srichandan1, M. Vogel1, C. Strunk1, C. Back1, D. Meier2, T. Kuschel2, J.M. Schmalhorst2, and G. Reiss211Physics department University of Regensburg, Regensburg, Germany — 2Thin Films and Physics of Nanostructures, Department of Physics, University of Bielefeld, Germany

Magneto-thermal effects are investigated in Permalloy (Py) films deposited on different substrates (MgO and GaAs). The transverse voltage Vy is measured with attached Pt stripes on the Py. The measurements are taken with different in plane temperature gradients (along x) up to 50 K and an applied in plane magnetic field at various angles. The obtained signals can be identified as a combination of the anomalous (ANE) and the planar (PNE) Nernst effects. The PNE follows a cos(Θ)sin(Θ)M∇T dependence, with M the magnetization, ∇T the temperature gradient and Θ being the angle between the two. The PNE voltage is of the order of µV which is consistent with the literature [1]. The ANE exhibits a cos(Θ) relation with an amplitude of about 100 nV and is connected to an out of plane temperature gradient. Additionally, a small, but non-negligible contribution of the spin-Seebeck effect is considered but its magnitude is orders smaller than reported in the literature [2]. A COMSOL simulation of the temperature distribution supplements our interpretation. Finally, we studied Nernst effects in Py films deposited SiN membranes.

[1]Vu DinH Ky, Phys. Stat. Sol. 17, K207 (1966)

[2]K. Uchida, Nature 455, 778-781 (2008)

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