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PhysRevMaterials.4.075402.pdf (1.13 MB)

Magnon diffusion lengths in bulk and thin film Fe3O4 for spin Seebeck applications

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posted on 2020-07-14, 10:21 authored by Guru Venkat, Chris Cox, D Voneshen, AJ Caruana, A Piovano, Michael Cropper, Kelly MorrisonKelly Morrison
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 $300\,\rm{K}$ 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

History

School

  • Science

Department

  • Physics

Published in

Physical Review Materials

Volume

4

Pages

075402

Publisher

American Physical Society

Version

  • 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

2020-06-16

Publication date

2020-07-10

Copyright date

2020

ISSN

2475-9953

Depositor

Dr Kelly Morrison Deposit date: 13 July 2020

Article number

075402

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