Dresden 2026 – scientific programme

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MA: Fachverband Magnetismus

MA 9: Magnonics I

MA 9.10: Talk

Monday, March 9, 2026, 17:30–17:45, HSZ/0004

Spin Hall micro-bars: Near zero effective magnetization for low oscillation-onset thresholds — •Abbas Koujok¹, Hidekazu Kurebayashi², kei Yamamoto³, Björn Heinz¹, Abbass Hamadeh⁴, Takeshi Seki⁵, and Philipp Pirro¹ — ¹Fachbereich Physik and Landesforschungszentrum OPTIMAS, Rheinland-Pfälzische Technische Universität Kaiserslautern-Landau, Kaiserslautern, Germany — ²London Centre for Nanotechnology, University College London, London, United Kingdom — ³Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Japan — ⁴Centre de Nanosciences et de Nanotechnologies, CNRS, Université Paris-Saclay, Palaiseau, France — ⁵Institute for Materials Research, Tohoku University, Sendai, Japan

Spin Hall devices, being promising building blocks in magnonic circuitry, are progressively being researched in the context of lowering required driving charge currents. Here, the impact of near zero effective magnetization on reducing oscillation-onset threshold in magnetic spin Hall micro-bars is studied using micro-focused Brillouin light scattering spectroscopy. We show that a threshold current density reduction of more than two orders of magnitude can be achieved in comparison to the lowest reported values from other studies in this regard. This reduction shows that controlling the effective magnetization can pave the way to employ spin Hall based devices as energy efficient elements in magnonic circuitry.

Keywords: Magnonics; Spin Hall effect; Effective magnetization; Oscillation-onset threshold