Dresden 2026 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 46: Spin Transport and Orbitronics, Spin-Hall Effects I (joint session MA/TT)

TT 46.9: Vortrag

Mittwoch, 11. März 2026, 12:00–12:15, POT/0112

Non-reciprocal spin-orbital-charge interconversion via magnon transport in nonlocal devices — •Jose Omar Ledesma-Martin¹, Sachin Krishnia¹, Edgar Galindez-Ruales¹, Duc Tran¹, Marcel Gasser¹, Dongwook Go^1,2, Gerhard Jakob¹, Yuriy Mokrousov^1,2, and Mathias Kläui¹ — ¹Institute of Physics, Johannes Gutenberg University Mainz, Mainz, Germany — ²Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, Jülich, Germany

In magnetic systems, angular momentum is carried by electrons' spin and orbital angular momentum. We use devices based on Pt nanowires on insulating magnets to study angular-momentum transport mediated by magnons, enabling angular-momentum information to propagate without charge flow. In these systems, magnons are generated by spin accumulation from the Spin Hall Effect (SHE) and detected via the inverse Spin Hall Effect (iSHE). In conventional Pt-YIG nonlocal geometries, this spin-charge interconversion is fully reciprocal: interchanging the injector and detector yields equal efficiencies. We further confirm that this power-to-power efficiency remains reciprocal when the thickness of one Pt wire is varied. However, when Ru is used as a source and detector of orbital currents via the orbital Hall effect (OHE) and inverse OHE, the reciprocity is broken. In our devices, the combined SHE + OHE-driven magnon generation, followed by detection through the iSHE, becomes ~35% more efficient than the reverse process, demonstrating nonreciprocity in the system. (1)

(1) J.O. Ledesma-Martin, Nano Lett. 2025, 25, 8, 3247-3252

Keywords: orbital Hall effect; orbital currents; non-reciprocity