Dresden 2014 – scientific programme

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MA: Fachverband Magnetismus

MA 47: Spincaloric Transport I (jointly with TT)

MA 47.4: Talk

Thursday, April 3, 2014, 17:30–17:45, HSZ 403

Magneto-thermopower on FeNi and FeCo thin films — •Sasmita Srichandan, Maximilian Schmid, Michael Vogel, Christoph Strunk, and Christian Back — Institute of Experimental and Applied Physics, University of Regensburg, 93040 Regensburg, Germany

We present measurements on the magneto-thermoelectric effects of 20 nm thick ferromagnetic films of permalloy (Py) [1] and FeCo alloy. The Py has been deposited on bulk MgO and GaAs substrates as well as on 100 nm thick SiN membranes. The dominant contribution to these effects turns out to be planar Nernst effect (PNE). For bulk substrate samples, the out of the plane temperature gradient gives rise to the anomalous Nernst effect (ANE). No ANE or transverse spin Seebeck effect (TSSE) signals are detected for the membrane samples. The observed TSSE for Py on bulk substrates is at least two orders of magnitude smaller than in earlier experiments [2].

In addition we study thermoelectric effects for FeCo alloy of various compositions deposited on the membrane. The advantage with FeCo is that the Fermi energy can be tuned throughout the band structure [3]. The domain walls in our samples are clearly visible in the TEM images. We present preliminary results of the effect of the domains on the thermoelectric effects.

[1] M. Schmid, S. Srichandan et.al PRL 111,187201(2013).

[2] K. Uchida et.al Nature 455,778(2008).

[3] K. Schwarz et.al J. Phys. F 14,2659(1984).