PhysRevMaterials.4.075402.pdf (1.13 MB)
Magnon diffusion lengths in bulk and thin film Fe3O4 for spin Seebeck applications
journal contribution
posted on 2020-07-14, 10:21 authored by Guru Venkat, Chris Cox, D Voneshen, AJ Caruana, A Piovano, Michael Cropper, Kelly MorrisonKelly MorrisonThe 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 $300\,\rm{K}$ in an
$\rm{Fe}_{3}\rm{O}_{4}$ 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 $\rm{Fe}_{3}\rm{O}_{4}$ 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 $\rm{Fe}_{3}\rm{O}_{4}$.
Funding
Reliable, Scalable and Affordable Thermoelectrics: Spin Seebeck Based Devices for Energy Conversion : EP/P006221/1
Feasibility of heat conversion to electricity by new spin Seebeck based thermoelectrics : EP/L024918/1
Underpinning Multi-User Equipment : EP/P030599/1
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- Science
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- Physics
Published in
Physical Review MaterialsVolume
4Pages
075402Publisher
American Physical SocietyVersion
- VoR (Version of Record)
Publisher statement
This is an Open Access Article. It is published by American Physical Society under the Creative Commons Attribution 4.0 Unported Licence (CC BY). Full details of this licence are available at: http://creativecommons.org/licenses/by/4.0/Acceptance date
2020-06-16Publication date
2020-07-10Copyright date
2020ISSN
2475-9953Publisher version
Depositor
Dr Kelly Morrison Deposit date: 13 July 2020Article number
075402Usage metrics
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