Influence of Thickness and Interface on the Low-Temperature Enhancement of the Spin Seebeck Effect in YIG Films
The temperature-dependent longitudinal spin Seebeck effect (LSSE) in heavy metal (HM)/Y_{3}Fe_{5}O_{12} (YIG) hybrid structures is investigated as a function of YIG film thickness, magnetic field strength, and different HM detection materials. The LSSE signal shows a large enhancement with reduction...
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2016-07-01
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Series: | Physical Review X |
Online Access: | http://doi.org/10.1103/PhysRevX.6.031012 |
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doaj-d578992e4c7347bab7499d65ad98e5b32020-11-24T20:40:15ZengAmerican Physical SocietyPhysical Review X2160-33082016-07-016303101210.1103/PhysRevX.6.031012Influence of Thickness and Interface on the Low-Temperature Enhancement of the Spin Seebeck Effect in YIG FilmsEr-Jia GuoJoel CramerAndreas KehlbergerCiaran A. FergusonDonald A. MacLarenGerhard JakobMathias KläuiThe temperature-dependent longitudinal spin Seebeck effect (LSSE) in heavy metal (HM)/Y_{3}Fe_{5}O_{12} (YIG) hybrid structures is investigated as a function of YIG film thickness, magnetic field strength, and different HM detection materials. The LSSE signal shows a large enhancement with reductions in temperature, leading to a pronounced peak at low temperatures. We find that the LSSE peak temperature strongly depends on the film thickness as well as on the magnetic field. Our result can be well explained in the framework of magnon-driven LSSE by taking into account the temperature-dependent effective propagation length of thermally excited magnons in the bulk of the material. We further demonstrate that the LSSE peak is significantly shifted by changing the interface coupling to an adjacent detection layer, revealing a more complex behavior beyond the currently discussed bulk effect. By direct microscopic imaging of the interface, we correlate the observed temperature dependence with the interface structure between the YIG and the adjacent metal layer. Our results highlight the role of interface effects on the temperature-dependent LSSE in HM/YIG system, suggesting that the temperature-dependent spin current transparency strikingly relies on the interface conditions.http://doi.org/10.1103/PhysRevX.6.031012 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Er-Jia Guo Joel Cramer Andreas Kehlberger Ciaran A. Ferguson Donald A. MacLaren Gerhard Jakob Mathias Kläui |
spellingShingle |
Er-Jia Guo Joel Cramer Andreas Kehlberger Ciaran A. Ferguson Donald A. MacLaren Gerhard Jakob Mathias Kläui Influence of Thickness and Interface on the Low-Temperature Enhancement of the Spin Seebeck Effect in YIG Films Physical Review X |
author_facet |
Er-Jia Guo Joel Cramer Andreas Kehlberger Ciaran A. Ferguson Donald A. MacLaren Gerhard Jakob Mathias Kläui |
author_sort |
Er-Jia Guo |
title |
Influence of Thickness and Interface on the Low-Temperature Enhancement of the Spin Seebeck Effect in YIG Films |
title_short |
Influence of Thickness and Interface on the Low-Temperature Enhancement of the Spin Seebeck Effect in YIG Films |
title_full |
Influence of Thickness and Interface on the Low-Temperature Enhancement of the Spin Seebeck Effect in YIG Films |
title_fullStr |
Influence of Thickness and Interface on the Low-Temperature Enhancement of the Spin Seebeck Effect in YIG Films |
title_full_unstemmed |
Influence of Thickness and Interface on the Low-Temperature Enhancement of the Spin Seebeck Effect in YIG Films |
title_sort |
influence of thickness and interface on the low-temperature enhancement of the spin seebeck effect in yig films |
publisher |
American Physical Society |
series |
Physical Review X |
issn |
2160-3308 |
publishDate |
2016-07-01 |
description |
The temperature-dependent longitudinal spin Seebeck effect (LSSE) in heavy metal (HM)/Y_{3}Fe_{5}O_{12} (YIG) hybrid structures is investigated as a function of YIG film thickness, magnetic field strength, and different HM detection materials. The LSSE signal shows a large enhancement with reductions in temperature, leading to a pronounced peak at low temperatures. We find that the LSSE peak temperature strongly depends on the film thickness as well as on the magnetic field. Our result can be well explained in the framework of magnon-driven LSSE by taking into account the temperature-dependent effective propagation length of thermally excited magnons in the bulk of the material. We further demonstrate that the LSSE peak is significantly shifted by changing the interface coupling to an adjacent detection layer, revealing a more complex behavior beyond the currently discussed bulk effect. By direct microscopic imaging of the interface, we correlate the observed temperature dependence with the interface structure between the YIG and the adjacent metal layer. Our results highlight the role of interface effects on the temperature-dependent LSSE in HM/YIG system, suggesting that the temperature-dependent spin current transparency strikingly relies on the interface conditions. |
url |
http://doi.org/10.1103/PhysRevX.6.031012 |
work_keys_str_mv |
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