Long range pure magnon spin diffusion observed in a non-local spin-Seebeck geometry

Abstract

The spin diffusion length for thermally excited magnon spins is measured by utilizing a non-local spin-Seebeck effect measurement. In a bulk single crystal of yttrium iron garnet (YIG) a focused laser thermally excites magnon spins. The spins diffuse laterally and are sampled using a Pt inverse spin Hall effect detector. Thermal transport modeling and temperature dependent measurements demonstrate the absence of spurious temperature gradients beneath the Pt detector and confirm the non-local nature of the experimental geometry. Remarkably, we find that thermally excited magnon spins in YIG travel over 120 $\mu$m at 23 K, indicating that they are robust against inelastic scattering. The spin diffusion length is found to be at least 47 $\mu$m and as high as 73 $\mu$m at 23 K in YIG, while at room temperature it drops to less than 10 $\mu$m. Based on this long spin diffusion length, we envision the development of thermally powered spintronic devices based on electrically insulating, but spin conducting materials.

35 Pages, 9 figures, and 4 Tables, reorganized article with thermal modeling details in appendices, main results unchanged

References in corpus (11)

• Spin Seebeck insulator
• Long distance transport of magnon spin information in a magnetic insulator at room temperature
• Observation of the Spin-Seebeck Effect in a Ferromagnetic Semiconductor
• Realization of XNOR and NAND spin-wave logic gates
• Universal Scaling Behavior of Anomalous Hall Effect and Anomalous Nernst Effect in Itinerant Ferromagnets
• Critical suppression of spin Seebeck effect by magnetic fields
• Magnon Mediated Electric Current Drag Across a Ferromagnetic Insulator Layer
• Spin convertance at magnetic interfaces
• The effect of the magnon dispersion on the longitudinal spin Seebeck effect in yttrium iron garnets (YIG)
• Surface sensitivity of the spin Seebeck effect
• Dynamic phase diagram of dc-pumped magnon condensates

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