Thickness dependence of anomalous Nernst coefficient and longitudinal spin Seebeck effect in ferromagnetic NixFe100−x films
Abstract Spin Seebeck effect (SSE) measured for metallic ferromagnetic thin films in commonly used longitudinal configuration contains the contribution from anomalous Nernst effect (ANE). The ANE is considered to arise from the bulk of the ferromagnet (FM) and the proximity-induced FM boundary layer...
Main Authors: | , , , , |
---|---|
Format: | Article |
Language: | English |
Published: |
Nature Publishing Group
2017-07-01
|
Series: | Scientific Reports |
Online Access: | https://doi.org/10.1038/s41598-017-05946-1 |
id |
doaj-3afa79bdfb4348b2bd69c0a5fb82669c |
---|---|
record_format |
Article |
spelling |
doaj-3afa79bdfb4348b2bd69c0a5fb82669c2020-12-08T03:03:40ZengNature Publishing GroupScientific Reports2045-23222017-07-01711710.1038/s41598-017-05946-1Thickness dependence of anomalous Nernst coefficient and longitudinal spin Seebeck effect in ferromagnetic NixFe100−x filmsHarsha Kannan0Xin Fan1Halise Celik2Xiufeng Han3John Q. Xiao4Department of Physics and Astronomy, University of DelawareDepartment of Physics and Astronomy, University of DelawareDepartment of Physics and Astronomy, University of DelawareState Key Laboratory of Magnetism, Institute of Physics, Chinese Academy of ScienceDepartment of Physics and Astronomy, University of DelawareAbstract Spin Seebeck effect (SSE) measured for metallic ferromagnetic thin films in commonly used longitudinal configuration contains the contribution from anomalous Nernst effect (ANE). The ANE is considered to arise from the bulk of the ferromagnet (FM) and the proximity-induced FM boundary layer. We fabricate a FM alloy with zero Nernst coefficient to mitigate the ANE contamination of SSE and insert a thin layer of Cu to separate the heavy metal (HM) from the FM to avoid the proximity contribution. These modifications to the experiment should permit complete isolation of SSE from ANE in the longitudinal configuration. However, further thickness dependence studies and careful analysis of the results revealed, ANE contribution of the isolated FM alloy is twofold, surface and bulk. Both surface and bulk contributions, whose magnitudes are comparable to that of the SSE, can be modified by the neighboring layer. Hence surface contribution to the ANE in FM metals is an important effect that needs to be considered.https://doi.org/10.1038/s41598-017-05946-1 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Harsha Kannan Xin Fan Halise Celik Xiufeng Han John Q. Xiao |
spellingShingle |
Harsha Kannan Xin Fan Halise Celik Xiufeng Han John Q. Xiao Thickness dependence of anomalous Nernst coefficient and longitudinal spin Seebeck effect in ferromagnetic NixFe100−x films Scientific Reports |
author_facet |
Harsha Kannan Xin Fan Halise Celik Xiufeng Han John Q. Xiao |
author_sort |
Harsha Kannan |
title |
Thickness dependence of anomalous Nernst coefficient and longitudinal spin Seebeck effect in ferromagnetic NixFe100−x films |
title_short |
Thickness dependence of anomalous Nernst coefficient and longitudinal spin Seebeck effect in ferromagnetic NixFe100−x films |
title_full |
Thickness dependence of anomalous Nernst coefficient and longitudinal spin Seebeck effect in ferromagnetic NixFe100−x films |
title_fullStr |
Thickness dependence of anomalous Nernst coefficient and longitudinal spin Seebeck effect in ferromagnetic NixFe100−x films |
title_full_unstemmed |
Thickness dependence of anomalous Nernst coefficient and longitudinal spin Seebeck effect in ferromagnetic NixFe100−x films |
title_sort |
thickness dependence of anomalous nernst coefficient and longitudinal spin seebeck effect in ferromagnetic nixfe100−x films |
publisher |
Nature Publishing Group |
series |
Scientific Reports |
issn |
2045-2322 |
publishDate |
2017-07-01 |
description |
Abstract Spin Seebeck effect (SSE) measured for metallic ferromagnetic thin films in commonly used longitudinal configuration contains the contribution from anomalous Nernst effect (ANE). The ANE is considered to arise from the bulk of the ferromagnet (FM) and the proximity-induced FM boundary layer. We fabricate a FM alloy with zero Nernst coefficient to mitigate the ANE contamination of SSE and insert a thin layer of Cu to separate the heavy metal (HM) from the FM to avoid the proximity contribution. These modifications to the experiment should permit complete isolation of SSE from ANE in the longitudinal configuration. However, further thickness dependence studies and careful analysis of the results revealed, ANE contribution of the isolated FM alloy is twofold, surface and bulk. Both surface and bulk contributions, whose magnitudes are comparable to that of the SSE, can be modified by the neighboring layer. Hence surface contribution to the ANE in FM metals is an important effect that needs to be considered. |
url |
https://doi.org/10.1038/s41598-017-05946-1 |
work_keys_str_mv |
AT harshakannan thicknessdependenceofanomalousnernstcoefficientandlongitudinalspinseebeckeffectinferromagneticnixfe100xfilms AT xinfan thicknessdependenceofanomalousnernstcoefficientandlongitudinalspinseebeckeffectinferromagneticnixfe100xfilms AT halisecelik thicknessdependenceofanomalousnernstcoefficientandlongitudinalspinseebeckeffectinferromagneticnixfe100xfilms AT xiufenghan thicknessdependenceofanomalousnernstcoefficientandlongitudinalspinseebeckeffectinferromagneticnixfe100xfilms AT johnqxiao thicknessdependenceofanomalousnernstcoefficientandlongitudinalspinseebeckeffectinferromagneticnixfe100xfilms |
_version_ |
1724392926483578880 |