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

Abstract

We present a systematic study of the temperature dependence of diffusive magnon 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 ${\lambda }_m$ for temperatures from 2 to 293 K. Values of ${\lambda }_m$ obtained from electrical and thermal generation agree within the experimental error, with ${\lambda }_m=9.6\pm 0.9$ $\mu$m at room temperature to a minimum of ${\lambda }_m=5.5\pm 0.7$ $\mu$m at 30 K. Using a 2D finite element model to fit the data obtained for electrical magnon generation we extract the magnon spin conductivity ${\sigma }_m$ as a function of temperature, which is reduced from ${\sigma }_m=5.1\pm 0.2\times 10^5$ S/m at room temperature to ${\sigma }_m=0.7\pm 0.4\times 10^5$ S/m at 5 K. Finally, we observe an enhancement of the signal originating from thermally generated magnons for low temperatures, where a maximum is observed around $T=7$ K. An explanation for this low temperature enhancement is however still missing and requires additional investigations.

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• Long distance transport of magnon spin information in a magnetic insulator at room temperature
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• Origin of the thickness-dependent low-temperature enhancement of spin Seebeck effect in YIG films
• Simultaneous detection of the spin-Hall magnetoresistance and the spin-Seebeck effect in Platinum and Tantalum on Yttrium Iron Garnet
• Magnetic field dependence of the magnon spin diffusion length in the magnetic insulator yttrium iron garnet
• Competing effects at Pt/YIG interfaces: spin Hall magnetoresistance, magnon excitations and magnetic frustration
• Transport between metals and magnetic insulators

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