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Spin Seebeck effect in polycrystalline yttrium iron garnet pellets prepared by the solid-state method [Letter]

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journal contribution
posted on 28.06.2019, 12:15 authored by Guru Venkat, T.A. Rose, Chris Cox, G.B.G. Stenning, Andrew J. Caruana, Kelly MorrisonKelly Morrison
We study the properties of polycrystalline bulk yttrium iron garnet (YIG) pellets prepared by the solid-state method, where the choice of the sintering temperature can lead to mixed phases of yttrium iron perovskite (YIP) and YIG or single phase YIG. Magnetometry shows multiple switching regimes in the mixed-phase pellets where the saturation magnetization is dominated by the proportion of YIG present. Ferromagnetic resonance was used to corroborate the saturation magnetization from magnetometry and to extract the spin wave damping α. The lowest damping was observed for the YIG pellet, which resulted in a spin Seebeck effect (SSE) coefficient that was approximately 55% of single crystal YIG. This demonstrates that macroscale crystallization does not play a major role in the SSE and paves the way for utilising polycrystalline samples for thermomagnetic applications.

Funding

This work was supported by the EPSRC Fellowship (EP/P006221/1).

History

School

  • Science

Department

  • Physics

Published in

EPL (Europhysics Letters)

Volume

126

Issue

3

Pages

37001 - 37001

Citation

VENKAT, G. ... et al., 2019. Spin Seebeck effect in polycrystalline yttrium iron garnet pellets prepared by the solid-state method. EPL (Europhysics Letters), 126(3): 37001.

Publisher

© EPLA. Published by IOP Publishing

Version

VoR (Version of Record)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution 3.0 Unported (CC BY 3.0) licence. Full details of this licence are available at: http://creativecommons.org/licenses/by/3.0/

Acceptance date

03/05/2019

Publication date

2019-05-31

Copyright date

2019

Notes

This is an Open Access Article. It is published by IOP 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/

eISSN

1286-4854

Language

en

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