Magnetic field dependence of the magnon spin diffusion length in the magnetic insulator yttrium iron garnet

Abstract

We investigated the effect of an external magnetic field on the diffusive spin transport by magnons in the magnetic insulator yttrium iron garnet (YIG), using a non-local magnon transport measurement geometry. We observed a decrease in magnon spin diffusion length ${\lambda }_m$ for increasing field strengths, where ${\lambda }_m$ is reduced from 9.6$\pm 1.2$ $\mu$m at 10 mT to 4.2$\pm 0.6$ $\mu$m at 3.5 T at room temperature. In addition, we find that there must be at least one additional transport parameter that depends on the external magnetic field. Our results do not allow us to unambiguously determine whether this is the magnon equilibrium density or the magnon diffusion constant. These results are significant for experiments in the more conventional longitudinal spin Seebeck geometry, since the magnon spin diffusion length sets the length scale for the spin Seebeck effect as well and is relevant for its understanding.

6 pages, 5 figures

References in corpus (8)

• Spin Seebeck insulator
• Long distance transport of magnon spin information in a magnetic insulator at room temperature
• Theory of magnon-driven spin Seebeck effect
• Critical suppression of spin Seebeck effect by magnetic fields
• The effect of the magnon dispersion on the longitudinal spin Seebeck effect in yttrium iron garnets (YIG)
• Long range pure magnon spin diffusion observed in a non-local spin-Seebeck geometry
• Simultaneous detection of the spin-Hall magnetoresistance and the spin-Seebeck effect in Platinum and Tantalum on Yttrium Iron Garnet
• Magnetic field control of the spin Seebeck effect

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