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MA: Fachverband Magnetismus

MA 59: Magnonics III

MA 59.9: Vortrag

Freitag, 13. März 2026, 11:45–12:00, POT/0361

Nonlinearly controllable magnonic mode-converter in a synthetic antiferromagnet — •Mujin You^1,2, Moojune Song², Jun Seok Seo², Sanghoon Kim³, Yoichi Shiota⁴, Teruo Ono⁴, Se Kwon Kim¹, Albert M. Park², Kab-Jin Kim², Mathias Weiler¹, and Philipp Pirro¹ — ¹Fachbereich Physik and Landesforschungszentrum OPTIMAS, Rheinland-Pfälzische Technische Universität Kaiserlautern-Landau, Germany — ²Department of Physics, Korea Advanced Institute of Science and Technology (KAIST), Korea — ³Department of Nano-semiconductor Engineering, University of Ulsan, Korea — ⁴Institute for Chemical Research, Kyoto University, Uji, Japan

Exploring and controlling nonlinear regimes enables new functionalities in hybrid magnonic systems, including phenomena such as nonlinear anticrossing gap closure and bistability in magnon dispersion. In this work, we observe mode hopping between acoustic and optic modes in a SAF, occurring at the magnetic field where the optic frequency becomes twice the acoustic frequency-consistent with a three-magnon interaction process. Based on this nonlinear mode-hopping behavior, we demonstrate an electrically tunable, nanoscale GHz-range mode-converter. These findings reveal a promising application via nonlinear coupling between acoustic and optic magnons in SAFs, paving the way for energy-efficient, reconfigurable magnonic devices.

Keywords: Nonlinear; Magnon; Synthetic antiferromagnet; Mode-converter