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Kehlberger A, Ritzmann U, Hinzke D, et al. Length Scale of the Spin Seebeck Effect. Phys Rev Lett. 2015;115(9):096602doi: 10.1103/PhysRevLett.115.096602.
Kehlberger, A., Ritzmann, U., Hinzke, D., Guo, E. J., Cramer, J., Jakob, G., Onbasli, M. C., Kim, D. H., Ross, C. A., Jungfleisch, M. B., Hillebrands, B., Nowak, U., & Kläui, M. (2015). Length Scale of the Spin Seebeck Effect. Physical review letters, 115(9), 096602. https://doi.org/10.1103/PhysRevLett.115.096602
Kehlberger, Andreas, et al. "Length Scale of the Spin Seebeck Effect." Physical review letters vol. 115,9 (2015): 096602. doi: https://doi.org/10.1103/PhysRevLett.115.096602
Kehlberger A, Ritzmann U, Hinzke D, Guo EJ, Cramer J, Jakob G, Onbasli MC, Kim DH, Ross CA, Jungfleisch MB, Hillebrands B, Nowak U, Kläui M. Length Scale of the Spin Seebeck Effect. Phys Rev Lett. 2015 Aug 28;115(9):096602. doi: 10.1103/PhysRevLett.115.096602. Epub 2015 Aug 28. PMID: 26371671.
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Phys Rev Lett. 2015 Aug 28;115(9):096602. doi: 10.1103/PhysRevLett.115.096602. Epub 2015 Aug 28.

Length Scale of the Spin Seebeck Effect.

Physical review letters

Andreas Kehlberger, Ulrike Ritzmann, Denise Hinzke, Er-Jia Guo, Joel Cramer, Gerhard Jakob, Mehmet C Onbasli, Dong Hun Kim, Caroline A Ross, Matthias B Jungfleisch, Burkard Hillebrands, Ulrich Nowak, Mathias Kläui

Affiliations

  1. Institute of Physics, Johannes Gutenberg-University Mainz, 55099 Mainz, Germany.
  2. Department of Physics, University of Konstanz, D-78457 Konstanz, Germany.
  3. Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
  4. Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA.
  5. Fachbereich Physik and Landesforschungszentrum OPTIMAS, Technische Universität Kaiserslautern, Kaiserslautern 67663, Germany.

PMID: 26371671 DOI: 10.1103/PhysRevLett.115.096602

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.

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