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MA: Fachverband Magnetismus

MA 55: Poster II

MA 55.11: Poster

Freitag, 4. April 2014, 10:30–13:30, P2

Spin Seebeck effect induced by resistive Joule heating — M. Schreier¹, N. Roschewsky¹, E. Dobler¹, S. Meyer¹, •R. Roesslhuber¹, R. Gross^1,2, and S.T.B. Goennenwein¹ — ¹Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, Germany — ²Physik-Department, TUM, Germany

The spin Seebeck effect can be observed by applying a thermal gradient on a ferromagnet/normal metal hybrid structure, thus creating a thermal nonequilibrium state at the interface. As a result a pure spin current perpendicular to the interface is induced and converted into a charge current in the normal metal via the inverse spin Hall effect. So far, the thermal gradient was applied either by clamping the sample between two thermal reservoirs or by using local laser beam heating. Both techniques require a dedicated setup. Here we present a new and simple technique [1] for the generation of the thermal gradient wherein the normal metal layer itself is used as a resistive heater enabling spin Seeback experiments in standard magneto-transport cryostats. We show that the spin Seebeck effect can be recovered from the raw data by simply adding the voltage signals recorded for positive and negative current polarity. We performed measurements as a function of the external magnetic field strength and its orientation and show that the effect scales linearly with the applied power, as expected for a thermal effect. Supported by the DFG via SPP 1538 “Spin Caloric Transport” (project GO 944/4-1) and the German Excellence Initiative via the Nanosystems Initiative Munich (NIM).
[1] Schreier et al., arXiv:1309.6901, accepted for publication in APL