%0 Journal Article %1 muduli2021local %A Muduli, Prasanta %A Schlitz, Richard %A Kosub, Tobias %A Hübner, René %A Erbe, Artur %A Makarov, Denys %A Goennenwein, Sebastian T. B. %D 2021 %I American Institute of Physics %J APL Mater. %K b %N 2 %P 021122 %R 10.1063/5.0037860 %T Local and nonlocal spin Seebeck effect in lateral Pt–Cr$_2$O$_3$–Pt devices at low temperatures %U https://doi.org/10.1063/5.0037860 %V 9 %X We have studied thermally driven magnon spin transport (spin Seebeck effect, SSE) in heterostructures of antiferromagnetic α-$Cr_2O_3$ 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 $α-Cr_2O_3$ 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.

@article{muduli2021local, abstract = {We have studied thermally driven magnon spin transport (spin Seebeck effect, SSE) in heterostructures of antiferromagnetic α-$Cr_2O_3$ 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 $α-Cr_2O_3$ 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.}, added-at = {2021-03-02T10:01:15.000+0100}, author = {Muduli, Prasanta and Schlitz, Richard and Kosub, Tobias and Hübner, René and Erbe, Artur and Makarov, Denys and Goennenwein, Sebastian T. B.}, biburl = {https://www.bibsonomy.org/bibtex/2cd67f629256bb7132395393666236f63/ctqmat}, comment = {doi: 10.1063/5.0037860}, day = 22, description = {Local and nonlocal spin Seebeck effect in lateral Pt–Cr2O3–Pt devices at low temperatures: APL Materials: Vol 9, No 2}, doi = {10.1063/5.0037860}, interhash = {4499dd9f217f19d1e4aea4c7b5a19321}, intrahash = {cd67f629256bb7132395393666236f63}, journal = {APL Mater.}, keywords = {b}, month = {02}, number = 2, pages = 021122, publisher = {American Institute of Physics}, timestamp = {2023-10-19T14:03:21.000+0200}, title = {Local and nonlocal spin Seebeck effect in lateral Pt–Cr$_{\mathbf{2}}$O$_{\mathbf{3}}$–Pt devices at low temperatures}, url = {https://doi.org/10.1063/5.0037860}, volume = 9, year = 2021 }