We study the transport of thermally excited non-equilibrium magnons through the ferrimagnetic insulator YIG using two electrically isolated Pt strips as injector and detector. The diffusing magnons induce a non- local inverse spin Hall voltage in the detector corresponding to the so-called non-local spin Seebeck effect (SSE). We measure the non-local SSE as a function of temperature and strip separation. In experiments at room temperature we observe a sign change of the non-local SSE voltage at a characteristic strip separation d0, in agreement with previous investigations. At lower temperatures however, we find a strong temperature dependence of d0. This suggests that both the angular momentum transfer across the YIG/Pt interface as well as the transport mechanism of the magnons in YIG as a function of temperature must be taken into account to describe the non-local spin Seebeck effect.
@article{arxiv.1701.02635,
title = {Temperature dependence of the non-local spin Seebeck effect in YIG/Pt nanostructures},
author = {Kathrin Ganzhorn and Tobias Wimmer and Joel Cramer and Richard Schlitz and Stephan Geprägs and Gerhard Jakob and Rudolf Gross and Hans Huebl and Mathias Kläui and Sebastian T. B. Goennenwein},
journal= {arXiv preprint arXiv:1701.02635},
year = {2017}
}