Length Scale of the Spin Seebeck Effect
Name
PhysRevLett.115.096602.pdf
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403.52 KB
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Author(s)
Kehlberger, Andreas
Ritzmann, Ulrike
Hinzke, Denise
Guo, Er-Jia
Cramer, Joel
Jakob, Gerhard
Ross, Caroline A.
Jungfleisch, Matthias B.
Hillebrands, Burkard
Nowak, Ulrich
Date Issued
August 2015
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Kehlberger, Andreas, Ulrike Ritzmann, Denise Hinzke, Er-Jia Guo, Joel Cramer, Gerhard Jakob, Mehmet C. Onbasli, et al. “Length Scale of the Spin Seebeck Effect.” Physical Review Letters 115, no. 9 (August 28, 2015). © 2015 American Physical Society
Version
Final published version
Abstract
We investigate the origin of the spin Seebeck effect in yttrium iron garnet (YIG) samples for film thicknesses from 20 nm to 50 μm at room temperature and 50 K. Our results reveal a characteristic increase of the longitudinal spin Seebeck effect amplitude with the thickness of the insulating ferrimagnetic YIG, which levels off at a critical thickness that increases with decreasing temperature. The observed behavior cannot be explained as an interface effect or by variations of the material parameters. Comparison to numerical simulations of thermal magnonic spin currents yields qualitative agreement for the thickness dependence resulting from the finite magnon propagation length. This allows us to trace the origin of the observed signals to genuine bulk magnonic spin currents due to the spin Seebeck effect ruling out an interface origin and allowing us to gauge the reach of thermally excited magnons in this system for different temperatures. At low temperature, even quantitative agreement with the simulations is found.
MIT Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.115.096602
