Dresden 2026 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 9: Magnonics I

MA 9.12: Vortrag

Montag, 9. März 2026, 18:00–18:15, HSZ/0004

Spin-wave emission with current-controlled frequency by a PMA-based spin-Hall oscillator — •Moritz Bechberger¹, David Breitbach¹, Abbas Koujok¹, Björn Heinz¹, Carsten Dubs², Abbass Hamadeh³, and Philipp Pirro¹ — ¹Fachbereich Physik and Landesforschungszentrum OPTIMAS, Rheinland-Pfälzische Technische Universität Kaiserslautern-Landau, D-67663 Kaiserslautern, Germany — ²INNOVENT e.V. Technologieentwicklung, D-07745 Jena, Germany — ³Université Paris-Saclay, Centre de Nanosciences et de Nanotechnologies, CNRS, 91120, Palaiseau, France

Spin-Hall oscillators (SHOs) are of particular interest for neuromorphic computing, as they are able to synchronize via spin waves. We demonstrate a SHO based on low-damping gallium-substituted yttrium-iron-garnet (Ga:YIG) with perpendicular magnetic anisotropy (PMA). In-plane magnetized Ga:YIG allows for the operation at a high efficiency level while also enabling resonant spin-wave emission by exploiting the positive nonlinear frequency shift. Via micro-focused Brillouin light scattering spectroscopy, we investigate the properties of auto-oscillation and emission. Multiple modes are excited and compete internally, with two emitted modes detected up to distances larger than 10 µm. Their frequencies combine to an extended bandwidth of approximately 1.6 GHz. The observed two-mode system and its transition to a single mode at higher currents are reproduced via micromagnetic simulations, which account for spatial variation of the PMA arising due to the microstructures on Ga:YIG. Our results propose a promising platform for SHOs with long-range coupling via spin waves.

Keywords: Spin-Hall oscillator; PMA; spin waves; Ga:YIG; SHO