Field Effects on Magnon‐Induced Domain Wall Motion in a Magnetic Insulator Racetrack

ABSTRACT The interactions between magnons and domain walls provide opportunities for extending the functionality of magnonic and spintronic devices. Building on our previous demonstration of field‐free magnon‐induced domain wall motion in low‐damping bismuth‐substituted yttrium iron garnet, this work explores the underlying dynamics and the effects of small magnetic fields on magnon‐driven domain wall motion. Time‐resolved imaging unveils the dynamical response of the garnet track to the RF signal, as well as the excitation of oscillations in a domain wall placed in the track. Magnon transmission is detected over distances of 70 µm from which a damping parameter is extracted. The combined influence of small out‐of‐plane fields (≤ 2 mT) and magnons on domain wall depinning and motion enables direction control. The findings culminate in the demonstration of robust, bidirectional domain wall motion up to 40 µm, establishing a pathway toward field‐tunable, low‐loss magnonic devices.