Dresden 2026 – scientific programme

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MA: Fachverband Magnetismus

MA 39: Poster Magnetism II

MA 39.1: Poster

Wednesday, March 11, 2026, 18:00–21:00, P2

Observation of negative orbital torque from Vanadium — •Jose Omar Ledesma Martin¹, Nikhil Vijayan¹, Durgesh Kumar¹, Ao Du¹, Lei Gao², Zijie Xiao², Hai I. Wang², Rahul Gupta¹, Gerhard Jakob¹, Sachin Krishnia¹, Yuriy Mokrousov^1,3, and Mathias Kläui¹ — ¹Institute of Physics, Johannes Gutenberg University Mainz, Germany — ²Max Planck Institute for Polymer Research, Germany — ³Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, Germany

Vanadium is predicted to exhibit a large orbital Hall effect. This effect is measured using ST-FMR, second-harmonic Hall, and THz emission, and all techniques reveal a negative orbital torque, in contrast to previous predictions and measurements that report a positive sign. The consistency in the results suggests the intrinsic origin of the OHE in our V samples. The torque magnitude depends strongly on the choice of ferromagnet: FeCoB/V, sensitive mainly to SHE-driven currents, shows only a weak response, whereas Ni/V, which efficiently converts OHE-driven currents, exhibits a torque nearly seven times larger. The torque increases with V thickness while remaining negative, and the extracted parameters indicate a large negative orbital Hall conductivity and long orbital diffusion length. Our results show that V generates strong orbital Hall currents with minimal spin Hall contribution and that itinerant interfacial orbital currents play a decisive role in determining both the efficiency and the sign of the torque (1).

(1) Vijayan, N. et al., arXiv:2508.16339 (2025).

Keywords: Orbital currents; Orbital Hall effect