In this Letter, we present the results of transient thermopower experiments, performed at room temperature on yttrium iron garnet/platinum bilayers. Upon application of a time-varying thermal gradient, we observe a characteristic low-pass frequency response of the ensuing thermopower voltage with cutoff frequencies of up to 37 MHz. We interpret our results in terms of the spin Seebeck effect, and argue that small wavevector magnons are of minor importance for the spin Seebeck effect in our thin film hybrid structures.
Time resolved spin Seebeck effect experiments
Niklas Roschewsky, Michael Schreier, Akashdeep Kamra, Felix Schade, Kathrin Ganzhorn, Sibylle Meyer, Hans Huebl, Stephan Geprägs, Rudolf Gross, Sebastian T. B. Goennenwein; Time resolved spin Seebeck effect experiments. Appl. Phys. Lett. 19 May 2014; 104 (20): 202410. https://doi.org/10.1063/1.4879462
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