Magnons transport spin angular momentum without involving charge current, offering the potential for energy-efficient spintronic devices. While the generation, manipulation, and detection of magnons, key elements for magnonic devices, have been demonstrated in various systems, electrical control of the magnon diffusion length (λm) has not been reported. In this work, we demonstrate electrical control of λm in three-terminal Pt/YIG devices, where injector-to-detector distance and modulator widths are systematically varied. We observe that λm can be effectively tuned by the modulation current, with strong dependence on the injection current (Iinj). At low Iinj, λm increases from 0.84 to 1.8 μm under a modulation current density of 5.5 × 107 A/cm2. Remarkably, the modulation efficiency improves at higher Iinj, attributed to the overpopulation of subthermal magnons and their increased sensitivity to current-induced spin-orbit torque. Our findings highlight the potential of the electrical manipulation of λm, paving the way for the development of practical magnonic devices.
Kim et al. (Tue,) studied this question.