Influence of Thickness and Interface on the Low-Temperature Enhancement of the Spin Seebeck Effect in YIG Films

Guo, Er-Jia; Cramer, Joel; Kehlberger, Andreas; Ferguson, Ciaran A.; MacLaren, Donald A.; Jakob, Gerhard; Kläui, Mathias

doi:10.1103/PhysRevX.6.031012

Title: Influence of Thickness and Interface on the Low-Temperature Enhancement of the Spin Seebeck Effect in YIG Films

Journal Article · Wed Jul 27 00:00:00 EDT 2016 · Physical Review. X

DOI:https://doi.org/10.1103/PhysRevX.6.031012· OSTI ID:1273680

Guo, Er-Jia; Cramer, Joel; Kehlberger, Andreas; Ferguson, Ciaran A.; MacLaren, Donald A.; Jakob, Gerhard; Kläui, Mathias

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 materials. The LSSE signal shows a large enhancement with reductions in temperature, leading to a pronounced peak at low temperatures. Here 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. Finally, 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.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Laboratory Directed Research and Development (LDRD) Program; German Research Foundation (DFG)

Grant/Contract Number:: 56268455; AC05-00OR22725

OSTI ID:: 1273680

Alternate ID(s):: OSTI ID: 1319211

Journal Information:: Physical Review. X, Journal Name: Physical Review. X Vol. 6 Journal Issue: 3; ISSN 2160-3308

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 122 works

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