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Longitudinal spin Seebeck coefficient: heat flux vs. temperature difference method

The determination of the longitudinal spin Seebeck effect (LSSE) coefficient is currently plagued by a large uncertainty due to the poor reproducibility of the experimental conditions used in its measurement. In this work we present a detailed analysis of two different methods used for the determina...

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Autores principales: Sola, A., Bougiatioti, P., Kuepferling, M., Meier, D., Reiss, G., Pasquale, M., Kuschel, T., Basso, V.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5404258/
https://www.ncbi.nlm.nih.gov/pubmed/28440288
http://dx.doi.org/10.1038/srep46752
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author Sola, A.
Bougiatioti, P.
Kuepferling, M.
Meier, D.
Reiss, G.
Pasquale, M.
Kuschel, T.
Basso, V.
author_facet Sola, A.
Bougiatioti, P.
Kuepferling, M.
Meier, D.
Reiss, G.
Pasquale, M.
Kuschel, T.
Basso, V.
author_sort Sola, A.
collection PubMed
description The determination of the longitudinal spin Seebeck effect (LSSE) coefficient is currently plagued by a large uncertainty due to the poor reproducibility of the experimental conditions used in its measurement. In this work we present a detailed analysis of two different methods used for the determination of the LSSE coefficient. We have performed LSSE experiments in different laboratories, by using different setups and employing both the temperature difference method and the heat flux method. We found that the lack of reproducibility can be mainly attributed to the thermal contact resistance between the sample and the thermal baths which generate the temperature gradient. Due to the variation of the thermal resistance, we found that the scaling of the LSSE voltage to the heat flux through the sample rather than to the temperature difference across the sample greatly reduces the uncertainty. The characteristics of a single YIG/Pt LSSE device obtained with two different setups was (1.143 ± 0.007) 10(−7) Vm/W and (1.101 ± 0.015) 10(−7) Vm/W with the heat flux method and (2.313 ± 0.017) 10(−7) V/K and (4.956 ± 0.005) 10(−7) V/K with the temperature difference method. This shows that systematic errors can be considerably reduced with the heat flux method.
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spelling pubmed-54042582017-04-27 Longitudinal spin Seebeck coefficient: heat flux vs. temperature difference method Sola, A. Bougiatioti, P. Kuepferling, M. Meier, D. Reiss, G. Pasquale, M. Kuschel, T. Basso, V. Sci Rep Article The determination of the longitudinal spin Seebeck effect (LSSE) coefficient is currently plagued by a large uncertainty due to the poor reproducibility of the experimental conditions used in its measurement. In this work we present a detailed analysis of two different methods used for the determination of the LSSE coefficient. We have performed LSSE experiments in different laboratories, by using different setups and employing both the temperature difference method and the heat flux method. We found that the lack of reproducibility can be mainly attributed to the thermal contact resistance between the sample and the thermal baths which generate the temperature gradient. Due to the variation of the thermal resistance, we found that the scaling of the LSSE voltage to the heat flux through the sample rather than to the temperature difference across the sample greatly reduces the uncertainty. The characteristics of a single YIG/Pt LSSE device obtained with two different setups was (1.143 ± 0.007) 10(−7) Vm/W and (1.101 ± 0.015) 10(−7) Vm/W with the heat flux method and (2.313 ± 0.017) 10(−7) V/K and (4.956 ± 0.005) 10(−7) V/K with the temperature difference method. This shows that systematic errors can be considerably reduced with the heat flux method. Nature Publishing Group 2017-04-25 /pmc/articles/PMC5404258/ /pubmed/28440288 http://dx.doi.org/10.1038/srep46752 Text en Copyright © 2017, The Author(s) http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
spellingShingle Article
Sola, A.
Bougiatioti, P.
Kuepferling, M.
Meier, D.
Reiss, G.
Pasquale, M.
Kuschel, T.
Basso, V.
Longitudinal spin Seebeck coefficient: heat flux vs. temperature difference method
title Longitudinal spin Seebeck coefficient: heat flux vs. temperature difference method
title_full Longitudinal spin Seebeck coefficient: heat flux vs. temperature difference method
title_fullStr Longitudinal spin Seebeck coefficient: heat flux vs. temperature difference method
title_full_unstemmed Longitudinal spin Seebeck coefficient: heat flux vs. temperature difference method
title_short Longitudinal spin Seebeck coefficient: heat flux vs. temperature difference method
title_sort longitudinal spin seebeck coefficient: heat flux vs. temperature difference method
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5404258/
https://www.ncbi.nlm.nih.gov/pubmed/28440288
http://dx.doi.org/10.1038/srep46752
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