Evidence for the role of the magnon energy relaxation length in the Spin Seebeck Effect

Abstract

Temperature-dependent spin-Seebeck effect data on Pt|YIG (Y${}_3$Fe${}_5$O${}_{12}$)|GGG (Gd${}_3$Ga${}_5$O${}_{12}$) are reported for YIG films of various thicknesses. The effect is reported as a spin-Seebeck resistivity (SSR), the inverse spin-Hall field divided by the heat flux, to circumvent uncertainties about temperature gradients inside the films. The SSR is a non-monotonic function of YIG thickness. A diffusive model for magnon transport demonstrates how these data give evidence for the existence of two distinct length scales in thermal spin transport, a spin diffusion length and a magnon energy relaxation length.

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• Thickness dependence of spin Peltier effect visualized by thermal imaging technique
• Nonlinear relaxation between magnons and phonons in insulating ferromagnets
• Observing Differential Spin Currents by Resonant Inelastic X-ray Scattering
• Magnonics in collinear magnetic insulating systems
• Spin Seebeck effect and phonon energy transfer in heterostructures containing layers of a normal metal and a ferromagnetic insulator
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• Signature of BKT-like spin transport in a quasi-2D antiferromagnet BaNi${}_2$V${}_2$O${}_8$
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• Frequency-dependent Phonon-mediated Unidirectional Magnetoresistance in a Metal on an Insulator with Highly Nonequilibrium Magnons
• Low temperature spin Seebeck effect in non-magnetic vanadium dioxide
• Spin Seebeck Effect in Correlated Antiferromagnetic V2O3