Regensburg 2013 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 50: Poster II

MA 50.69: Poster

Freitag, 15. März 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. Reiss² — ¹1Physics 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 V_y 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)