Spin transport via magnon diffusion in magnetic insulators is important for a broad range of spin-based phenomena and devices. However, the absence of the magnon equivalent of an electric force is a bottleneck. In this work, we demonstrate the controlled generation of magnon drift currents in yttrium iron garnet/platinum heterostructures. By performing electrical injection and detection of incoherent magnons, we find magnon drift currents that stem from the interfacial Dzyaloshinskii-Moriya interaction. We can further control the magnon drift by the orientation of the magnetic field. The drift current changes the magnon propagation length by up to ± 6 % relative to diffusion. We generalize the magnonic spin transport theory to include a finite drift velocity resulting from any inversion asymmetric interaction, and obtain results consistent with our experiments.
@article{arxiv.2106.12946,
title = {Control of nonlocal magnon spin transport via magnon drift currents},
author = {Richard Schlitz and Saül Vélez and Akashdeep Kamra and Charles-Henri Lambert and Michaela Lammel and Sebastian T. B. Goennenwein and Pietro Gambardella},
journal= {arXiv preprint arXiv:2106.12946},
year = {2021}
}