Local and nonlocal spin Seebeck effect in lateral Pt-Cr2O3-Pt devices at low temperatures
Local and nonlocal spin Seebeck effect in lateral Pt-Cr2O3-Pt devices at low temperatures
Muduli, P.; Schlitz, R.; Kosub, T.; Hübner, R.; Erbe, A.; Makarov, D.; Goennenwein, S. T. B.
We have studied thermally driven magnon spin transport (spin Seebeck e_ect, SSE) in heterostructures of antiferromagnetic 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 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 indicates 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.
Keywords: spin Seebeck effect; antiferromagnetic spintronics
Involved research facilities
- Ion Beam Center DOI: 10.17815/jlsrf-3-159
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- DOI: 10.17815/jlsrf-3-159 is cited by this (Id 32003) publication
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APL Materials 9(2021), 021122
DOI: 10.1063/5.0037860
Cited 11 times in Scopus
Permalink: https://www.hzdr.de/publications/Publ-32003