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We present a systematic study of the temperature dependence of diffusivemagnon spin transport, using a non-local device geometry. In our measurements,we detect spin signals arising from electrical and thermal magnon generation,and we directly extract the magnon spin diffusion length $\lambda_m$ fortemperatures from 2 to 293 K. Values of $\lambda_m$ obtained from electricaland thermal generation agree within the experimental error, with$\lambda_m=9.6\pm0.9$ $\mu$m at room temperature to a minimum of$\lambda_m=5.5\pm0.7$ $\mu$m at 30 K. Using a 2D finite element model to fitthe data obtained for electrical magnon generation we extract the magnon spinconductivity $\sigma_m$ as a function of temperature, which is reduced from$\sigma_m=5.1\pm0.2\times10^5$ S/m at room temperature to$\sigma_m=0.7\pm0.4\times10^5$ S/m at 5 K. Finally, we observe an enhancementof the signal originating from thermally generated magnons for lowtemperatures, where a maximum is observed around $T=7$ K. An explanation forthis low temperature enhancement is however still missing and requiresadditional investigations.

Temperature dependence of the magnon spin diffusion length and magnon spin conductivity in the magnetic insulator yttrium iron garnet