Regensburg 2025 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 14: Spin Transport and Orbitronics, Spin-Hall Effects I (joint session MA/TT)

TT 14.4: Talk

Tuesday, March 18, 2025, 10:15–10:30, H18

Non-reciprocity in magnon mediated charge-spin-orbital current interconversion — •Sachin Krishnia¹, Omar Ledesma-Martin¹, Edgar Galindez-Ruales¹, Felix Fuhrmann¹, Duc Tran¹, Rahul Gupta¹, Marcel Gasser^1,2, Dongwook Go^1,2, Gerhard Jakob¹, Yuriy Mokrousov¹, and Mathias Kläui¹ — ¹Institute of Physics, Johannes Gutenberg University Mainz, 55099 Mainz, Germany — ²Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, 52425 Jülich, Germany

In magnetic systems, angular momentum is carried by the spin and orbital degrees of freedom. Non-local devices can be used to study angular momentum transport. They consist of parallel heavy-metal nanowires placed on top of magnetic insulators like yttrium iron garnet (YIG), facilitating the transmission of information by magnons, generated by the accumulation of spin at the interface, created via the spin Hall effect (SHE) and detected via the inverse SHE (iSHE). It has been demonstrated that these processes have comparable efficiencies when the role of the detector and injector is reversed, which points to reciprocity of the processes. However, we show that by adding Ru as a source of direct and inverse orbital Hall effect (OHE), the system no longer exhibits this reciprocity. Specifically, the generation of magnons via the combination of SHE and OHE and detection via the iSHE is found to be about 35% more efficient than the inverse process for our system [1]. [1] O. Ledesma et al., arXiv:2411.07044 (2024).

Keywords: orbital current