Temperature dependence of the non-local spin Seebeck effect in YIG/Pt nanostructures

Kathrin Ganzhorn; Tobias Wimmer; Joel Cramer; Richard Schlitz; Stephan Geprägs; Gerhard Jakob; Rudolf Gross; Hans Huebl; Mathias Kläui; Sebastian T. B. Goennenwein

arXiv · 1701.02635

Temperature dependence of the non-local spin Seebeck effect in YIG/Pt nanostructures

Kathrin Ganzhorn·Tobias Wimmer·Joel Cramer·Richard Schlitz·Stephan Geprägs·Gerhard Jakob·Rudolf Gross·Hans Huebl·Mathias Kläui·Sebastian T. B. Goennenwein

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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 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.

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Kathrin Ganzhorn, Tobias Wimmer, Joel Cramer, Richard Schlitz, Stephan Geprägs, Gerhard Jakob, Rudolf Gross, Hans Huebl, Mathias Kläui, Sebastian T. B. Goennenwein. 2017-01-10. Temperature dependence of the non-local spin Seebeck effect in YIG/Pt nanostructures. https://arxiv.org/abs/1701.02635

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