Regensburg 2013 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 20: Transport: Spincaloric Transport (jointly with MA)

TT 20.6: Talk

Monday, March 11, 2013, 16:15–16:30, H22

Thermally excited magnonic spin currents probed by the longitudinal spin-Seebeck effect in YIG — •Andreas Kehlberger¹, René Röser¹, Gerhard Jakob¹, Benjamin Jungfleisch², Burkard Hillebrands², Ulrike Ritzmann³, Denise Hinzke³, Dong Hun Kim⁴, Caroline Ross⁴, Ulrich Nowak², and Mathias Kläui¹ — ¹Institute of Physics, Johannes Gutenberg-University Mainz, 55099 Mainz, Germany — ²Department of Physics, Institute of Technology Kaiserslautern, 67663 Kaiserslautern, Germany — ³Department of Physics, University of Konstanz, 78457 Konstanz, Germany — ⁴Department of Materials Science and Engineering, MIT , Cambridge, MA 02139, USA

In the research field of spin caloric transport one of most the prominent and still not understood effects is the spin-Seebeck effect (SSE) in magnetic insulators [1]. Many explanations consider thermally excited magnons as the underling mechanism, for which direct evidence is missing so far. We present a systematic study of the SSE in Yttrium Iron Garnet (YIG) films of different thicknesses. From the thickness dependence of the measured inverse spin Hall effect we can unambiguously identify the SSE effect . Corresponding simulations on atomistic length scales allow us to deduce the propagation length of the thermally excited magnons, which could be used to manipulate domain walls [2]. [1] K. Uchida et al., Nature Mater. 9, 894 (2010) [2] D. Hinzke et al., Phys. Rev. Lett. 107, 027205 (2011)