We report on coherent propagation of antiferromagnetic (AFM) spin waves over a long distance (∼10 μm) at room temperature in a canted AFM α-Fe2O3 with the Dzyaloshinskii-Moriya interaction (DMI). Unprecedented high group velocities (up to 22.5 km/s) are characterized by microwave transmission using all-electrical spin wave spectroscopy. We derive analytically AFM spin-wave dispersion in the presence of the DMI which accounts for our experimental results. The AFM spin waves excited by nanometric coplanar waveguides with large wavevectors enter the exchange regime and follow a quasi-linear dispersion relation. Fitting of experimental data with our theoretical model yields an AFM exchange stiffness length of 1.7 angstrom. Our results provide key insights on AFM spin dynamics and demonstrate high-speed functionality for AFM magnonics.
@article{arxiv.2211.10989,
title = {Long-distance propagation of high-velocity antiferromagnetic spin waves},
author = {Hanchen Wang and Rundong Yuan and Yongjian Zhou and Yuelin Zhang and Jilei Chen and Song Liu and Hao Jia and Dapeng Yu and Jean-Philippe Ansermet and Cheng Song and Haiming Yu},
journal= {arXiv preprint arXiv:2211.10989},
year = {2026}
}