Nonlocal magnon-polaron transport in yttrium iron garnet

Cornelissen LJ, Oyanagi K, Kikkawa T, Qiu Z, Kuschel T, Bauer GEW, van Wees BJ, Saitoh E (2017)
Physical Review B 96(10): 104441.

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Abstract
The spin Seebeck effect (SSE) is observed in magnetic insulator|heavy metal bilayers as an inverse spin Hall effect voltage under a temperature gradient. The SSE can be detected nonlocally as well, viz. in terms of the voltage in a second metallic contact (detector) on the magnetic film, spatially separated from the first contact that is used to apply the temperature bias (injector). Magnon-polarons are hybridized lattice and spin waves in magnetic materials, generated by the magnetoelastic interaction. Kikkawa et al. [Phys. Rev. Lett. 117, 207203 (2016)] interpreted a resonant enhancement of the local SSE in yttrium iron garnet (YIG) as a function of the magnetic field in terms of magnon-polaron formation. Here we report the observation of magnon-polarons in nonlocal magnon spin injection/detection devices for various injector-detector spacings and sample temperatures. Unexpectedly, we find that the magnon-polaron resonances can suppress rather than enhance the nonlocal SSE. Using finite element modeling, we explain our observations as a competition between the SSE and spin diffusion in YIG. These results give unprecedented insights into the magnon-phonon interaction in a key magnetic material.
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Cornelissen LJ, Oyanagi K, Kikkawa T, et al. Nonlocal magnon-polaron transport in yttrium iron garnet. Physical Review B. 2017;96(10): 104441.
Cornelissen, L. J., Oyanagi, K., Kikkawa, T., Qiu, Z., Kuschel, T., Bauer, G. E. W., van Wees, B. J., et al. (2017). Nonlocal magnon-polaron transport in yttrium iron garnet. Physical Review B, 96(10), 104441. doi:10.1103/physrevb.96.104441
Cornelissen, L. J., Oyanagi, K., Kikkawa, T., Qiu, Z., Kuschel, T., Bauer, G. E. W., van Wees, B. J., and Saitoh, E. (2017). Nonlocal magnon-polaron transport in yttrium iron garnet. Physical Review B 96:104441.
Cornelissen, L.J., et al., 2017. Nonlocal magnon-polaron transport in yttrium iron garnet. Physical Review B, 96(10): 104441.
L.J. Cornelissen, et al., “Nonlocal magnon-polaron transport in yttrium iron garnet”, Physical Review B, vol. 96, 2017, : 104441.
Cornelissen, L.J., Oyanagi, K., Kikkawa, T., Qiu, Z., Kuschel, T., Bauer, G.E.W., van Wees, B.J., Saitoh, E.: Nonlocal magnon-polaron transport in yttrium iron garnet. Physical Review B. 96, : 104441 (2017).
Cornelissen, L. J., Oyanagi, K., Kikkawa, T., Qiu, Z., Kuschel, Timo, Bauer, G. E. W., van Wees, B. J., and Saitoh, E. “Nonlocal magnon-polaron transport in yttrium iron garnet”. Physical Review B 96.10 (2017): 104441.
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