Local and nonlocal spin Seebeck effect in lateral Pt–Cr2O3–Pt devices at low temperatures

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2021
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Muduli, Prasanta
Schlitz, Richard
Kosub, Tobias
Hübner, René
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APL Materials. American Institute of Physics (AIP). 2021, 9(2), 021122. eISSN 2166-532X. Available under: doi: 10.1063/5.0037860
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We have studied thermally driven magnon spin transport (spin Seebeck effect, SSE) in heterostructures of antiferromagnetic α-Cr2O3 and Pt at low temperatures. Monitoring the amplitude of the local and nonlocal SSE signals as a function of temperature, we found that both decrease with increasing temperature and disappear above 100 K and 20 K, respectively. Additionally, both SSE signals show a tendency to saturate at low temperatures. The nonlocal SSE signal decays exponentially for intermediate injector–detector separation, consistent with magnon spin current transport in the relaxation regime. We estimate the magnon relaxation length of our α-Cr2O3 films to be around 500 nm at 3 K. This short magnon relaxation length along with the strong temperature dependence of the SSE signal indicate that temperature-dependent inelastic magnon scattering processes play an important role in the intermediate range magnon transport. Our observation is relevant to low-dissipation antiferromagnetic magnon memory and logic devices involving thermal magnon generation and transport.

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ISO 690MUDULI, Prasanta, Richard SCHLITZ, Tobias KOSUB, René HÜBNER, Artur ERBE, Denis MAKAROV, Sebastian T. B. GOENNENWEIN, 2021. Local and nonlocal spin Seebeck effect in lateral Pt–Cr2O3–Pt devices at low temperatures. In: APL Materials. American Institute of Physics (AIP). 2021, 9(2), 021122. eISSN 2166-532X. Available under: doi: 10.1063/5.0037860
BibTex
@article{Muduli2021Local-53018,
  year={2021},
  doi={10.1063/5.0037860},
  title={Local and nonlocal spin Seebeck effect in lateral Pt–Cr<sub>2</sub>O<sub>3</sub>–Pt devices at low temperatures},
  number={2},
  volume={9},
  journal={APL Materials},
  author={Muduli, Prasanta and Schlitz, Richard and Kosub, Tobias and Hübner, René and Erbe, Artur and Makarov, Denis and Goennenwein, Sebastian T. B.},
  note={Article Number: 021122}
}
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