Guo, E.-J., Cramer, J., Kehlberger, A., Ferguson, C. A., MacLaren, D. , Jakob, G. and Kläui, M. (2016) Influence of thickness and interface on the low-temperature enhancement of the spin Seebeck effect in YIG films. Physical Review X, 6, 031012. (doi: 10.1103/PhysRevX.6.031012)
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Abstract
The temperature dependent longitudinal spin Seebeck effect (LSSE) in heavy metal (HM)/Y3Fe5O12 (YIG) hybrid structures is investigated as a function of YIG film thickness, magnetic field strength, and different HM detection material. The LSSE signal shows a large enhancement with reducing the temperature, leading to a pronounced peak at low temperatures. We find 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 bulk. 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.
| Item Type: | Articles |
|---|---|
| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | MacLaren, Professor Donald and Ferguson, Mr Ciaran |
| Authors: | Guo, E.-J., Cramer, J., Kehlberger, A., Ferguson, C. A., MacLaren, D., Jakob, G., and Kläui, M. |
| College/School: | College of Science and Engineering > School of Physics and Astronomy |
| Journal Name: | Physical Review X |
| Publisher: | American Physical Society |
| ISSN: | 2160-3308 |
| ISSN (Online): | 2160-3308 |
| Copyright Holders: | Copyright © 2016 The Authors |
| First Published: | First published in Physical Review X 6: 031012 |
| Publisher Policy: | Reproduced under a Creative Commons License |
| Data DOI: | /10.5525/gla.researchdata.335 |
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