Temperature dependence of the non-local spin Seebeck effect in YIG/Pt nanostructures
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Abstract
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 d(0), in agreement with previous investigations. At lower temperatures however, we find a strong temperature dependence of d(0). 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 SSE. (C) 2017 Author(s).
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AIP Advances, 7, 8, American Inst. of Physics, New York, NY, 2017, https://doi.org/10.1063/1.4986848