Negligible spin–charge conversion in Bi films and Bi/Ag(Cu) bilayers

Negligible spin–charge conversion in Bi films and Bi/Ag(Cu) bilayers

Spin pumping experiments using ferromagnetic metals have reported highly efficient spin–charge conversion in Bi and at the Bi/Ag interface, possibly due to the inverse Rashba–Edelstein effect. However, longitudinal spin Seebeck effect experiments using the yttrium iron garnet ferrimagnetic insulator...

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Main Authors: Di Yue, Weiwei Lin, C. L. Chien
Format: Article
Language:English
Published: AIP Publishing LLC 2021-05-01
Series:APL Materials
Online Access:http://dx.doi.org/10.1063/5.0048042
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spelling doaj-09123f63005b494d9c8f4f8f5d870f3c2021-06-01T18:30:19ZengAIP Publishing LLCAPL Materials2166-532X2021-05-0195050904050904-1110.1063/5.0048042Negligible spin–charge conversion in Bi films and Bi/Ag(Cu) bilayersDi Yue0Weiwei Lin1C. L. Chien2Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USADepartment of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USADepartment of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USASpin pumping experiments using ferromagnetic metals have reported highly efficient spin–charge conversion in Bi and at the Bi/Ag interface, possibly due to the inverse Rashba–Edelstein effect. However, longitudinal spin Seebeck effect experiments using the yttrium iron garnet ferrimagnetic insulator in Bi films and Bi/Ag bilayers do not show evidence of appreciable spin-to-charge conversion except the large Nernst signal inherent to Bi. These contrasting conclusions highlight the differences between magnetic metals and magnetic insulators as spin current injectors. Only the detected voltages that adhere to the inverse spin Hall effect of jC = (2e/ℏ)θSH jS × σ are due to spin currents.http://dx.doi.org/10.1063/5.0048042
collection DOAJ
language English
format Article
sources DOAJ
author Di Yue
Weiwei Lin
C. L. Chien
spellingShingle Di Yue
Weiwei Lin
C. L. Chien
Negligible spin–charge conversion in Bi films and Bi/Ag(Cu) bilayers
APL Materials
author_facet Di Yue
Weiwei Lin
C. L. Chien
author_sort Di Yue
title Negligible spin–charge conversion in Bi films and Bi/Ag(Cu) bilayers
title_short Negligible spin–charge conversion in Bi films and Bi/Ag(Cu) bilayers
title_full Negligible spin–charge conversion in Bi films and Bi/Ag(Cu) bilayers
title_fullStr Negligible spin–charge conversion in Bi films and Bi/Ag(Cu) bilayers
title_full_unstemmed Negligible spin–charge conversion in Bi films and Bi/Ag(Cu) bilayers
title_sort negligible spin–charge conversion in bi films and bi/ag(cu) bilayers
publisher AIP Publishing LLC
series APL Materials
issn 2166-532X
publishDate 2021-05-01
description Spin pumping experiments using ferromagnetic metals have reported highly efficient spin–charge conversion in Bi and at the Bi/Ag interface, possibly due to the inverse Rashba–Edelstein effect. However, longitudinal spin Seebeck effect experiments using the yttrium iron garnet ferrimagnetic insulator in Bi films and Bi/Ag bilayers do not show evidence of appreciable spin-to-charge conversion except the large Nernst signal inherent to Bi. These contrasting conclusions highlight the differences between magnetic metals and magnetic insulators as spin current injectors. Only the detected voltages that adhere to the inverse spin Hall effect of jC = (2e/ℏ)θSH jS × σ are due to spin currents.
url http://dx.doi.org/10.1063/5.0048042
work_keys_str_mv AT diyue negligiblespinchargeconversioninbifilmsandbiagcubilayers
AT weiweilin negligiblespinchargeconversioninbifilmsandbiagcubilayers
AT clchien negligiblespinchargeconversioninbifilmsandbiagcubilayers
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