SKM 2021 – scientific programme

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MA: Fachverband Magnetismus

MA 11: Posters Magnetism III

MA 11.13: Poster

Wednesday, September 29, 2021, 13:30–16:30, P

Local and nonlocal spin Seebeck effect in lateral Pt-Cr₂O₃-Pt devices at low temperatures — •Prasanta Muduli¹, Richard Schlitz¹, Tobias Kosub², René Hübner², Artur Erbe², Denys Makarov², and Sebastian T. B. Goennenwein¹ — ¹Institut für Festköper- und Materialphysik and Würzburg-Dresden Cluster of Excellence ct.qmat, Technische Universiät Dresden, 01062 Dresden, Germany — ²Helmholtz-Zentrum Dresden-Rossendorf e.V., Institute of Ion Beam Physics and Materials Research, 01328 Dresden, Germany

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 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.