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 SSE.
Highlights
Magnons, the collective excitations in magnetically ordered systems, represent an attractive option for information transfer and processing
The mediated magnetoresistance (MMR) effect has been studied as a function of the distance d between injector and detector,[5] temperature[6] and magnetic field magnitude and orientation,[8] allowing for the extraction of the length scales involved in the magnon diffusion process
We systematically study the non-local spin Seebeck effect in Yttrium Iron Garnet (YIG)/Pt nanostructures as a function of temperature and strip separation and find that the non-local SSE voltage changes sign at a characteristic strip separation d0, which is strongly temperature dependent
Summary
The collective excitations in magnetically ordered systems, represent an attractive option for information transfer and processing.
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