Spin Seebeck effect mediated reversal of vortex-Nernst effect in superconductor-ferromagnet bilayers

We report on the observation of sign reversal of vortex-Nernst effect in epitaxial NbN/Fe bilayers deposited on MgO (001) substrates. Strong coupling between vortex magnetisation and ferromagnetic magnetisation at the NbN/Fe bilayer interface is presented. In NbN/Fe bilayer thin films an apparent si...

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Autores principales: Sharma, Himanshu, Wen, Zhenchao, Mizuguchi, Masaki
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2023
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10023796/
https://www.ncbi.nlm.nih.gov/pubmed/36932146
http://dx.doi.org/10.1038/s41598-023-31420-2
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author Sharma, Himanshu
Wen, Zhenchao
Mizuguchi, Masaki
author_facet Sharma, Himanshu
Wen, Zhenchao
Mizuguchi, Masaki
author_sort Sharma, Himanshu
collection PubMed
description We report on the observation of sign reversal of vortex-Nernst effect in epitaxial NbN/Fe bilayers deposited on MgO (001) substrates. Strong coupling between vortex magnetisation and ferromagnetic magnetisation at the NbN/Fe bilayer interface is presented. In NbN/Fe bilayer thin films an apparent sign reversal of vortex-Nernst signal under a temperature gradient with magnetic field and temperature is observed when the thickness of Fe is increased up to 5 nm. This reversal of the vortex-Nernst effect is associated with the enhancement of the spin Seebeck effects (SSE) near T(c) due to coherence peak effect (CPE) and strong coupling of vortex magnetisation and ferromagnetic magnetisation at the interface of the NbN/Fe bilayer. The observed large SSE via inverse spin Hall effect (ISHE) is due to the CPE below and close to T(C), highlighting the high spin to charge conversion efficiency of NbN in this region. This work may contribute to the development of superconducting spintronic devices by engineering the coupling of the superconductor/ferromagnet interface.
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spelling pubmed-100237962023-03-19 Spin Seebeck effect mediated reversal of vortex-Nernst effect in superconductor-ferromagnet bilayers Sharma, Himanshu Wen, Zhenchao Mizuguchi, Masaki Sci Rep Article We report on the observation of sign reversal of vortex-Nernst effect in epitaxial NbN/Fe bilayers deposited on MgO (001) substrates. Strong coupling between vortex magnetisation and ferromagnetic magnetisation at the NbN/Fe bilayer interface is presented. In NbN/Fe bilayer thin films an apparent sign reversal of vortex-Nernst signal under a temperature gradient with magnetic field and temperature is observed when the thickness of Fe is increased up to 5 nm. This reversal of the vortex-Nernst effect is associated with the enhancement of the spin Seebeck effects (SSE) near T(c) due to coherence peak effect (CPE) and strong coupling of vortex magnetisation and ferromagnetic magnetisation at the interface of the NbN/Fe bilayer. The observed large SSE via inverse spin Hall effect (ISHE) is due to the CPE below and close to T(C), highlighting the high spin to charge conversion efficiency of NbN in this region. This work may contribute to the development of superconducting spintronic devices by engineering the coupling of the superconductor/ferromagnet interface. Nature Publishing Group UK 2023-03-17 /pmc/articles/PMC10023796/ /pubmed/36932146 http://dx.doi.org/10.1038/s41598-023-31420-2 Text en © The Author(s) 2023 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
Sharma, Himanshu
Wen, Zhenchao
Mizuguchi, Masaki
Spin Seebeck effect mediated reversal of vortex-Nernst effect in superconductor-ferromagnet bilayers
title Spin Seebeck effect mediated reversal of vortex-Nernst effect in superconductor-ferromagnet bilayers
title_full Spin Seebeck effect mediated reversal of vortex-Nernst effect in superconductor-ferromagnet bilayers
title_fullStr Spin Seebeck effect mediated reversal of vortex-Nernst effect in superconductor-ferromagnet bilayers
title_full_unstemmed Spin Seebeck effect mediated reversal of vortex-Nernst effect in superconductor-ferromagnet bilayers
title_short Spin Seebeck effect mediated reversal of vortex-Nernst effect in superconductor-ferromagnet bilayers
title_sort spin seebeck effect mediated reversal of vortex-nernst effect in superconductor-ferromagnet bilayers
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10023796/
https://www.ncbi.nlm.nih.gov/pubmed/36932146
http://dx.doi.org/10.1038/s41598-023-31420-2
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AT wenzhenchao spinseebeckeffectmediatedreversalofvortexnernsteffectinsuperconductorferromagnetbilayers
AT mizuguchimasaki spinseebeckeffectmediatedreversalofvortexnernsteffectinsuperconductorferromagnetbilayers

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