Spin Seebeck effect and magnon diffusion length in ${\mathbf{Fe}}_3{\mathbf{O}}_4$

Abstract

The determination of the magnon diffusion length (MDL) is important for increasing the efficiency of spin Seebeck effect (SSE) based devices utilising non-metallic magnets. We extract the MDL at $50$ and $300\mathrm{K}$ in an ${\mathrm{Fe}}_3{\mathrm{O}}_4$ single crystal from the magnon dispersion obtained using inelastic neutron scattering (INS) and find them to be equal within error. We then measure the heat flux normalised SSE responses and in-plane magnetization of ${\mathrm{Fe}}_3{\mathrm{O}}_4$ thin films and normalise by the static magnetization contribution to the SSE before determining the MDLs from a fit of the thickness dependence. We find that the MDLs determined in this way are smaller than that measured from INS which maybe due to differences in magnon propagation between bulk and thin film ${\mathrm{Fe}}_3{\mathrm{O}}_4$.

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Cited by in corpus (3)

• Spin Seebeck Effect: Sensitive Probe for Elementary Excitation, Spin Correlation, Transport, Magnetic Order, and Domains in Solids
• Facet-dependent magnon-polarons in epitaxial ferrimagnetic Fe3O4 thin films
• Measurement of the heat flux normalised spin Seebeck coefficient of thin films as a function of temperature