Spin waves may enable low-power devices based on spin information transmission that is free of Joule heating. Antiferromagnetic-type spin waves have intrinsic advantages, such as high speed, dual-polarized and robust against external field perturbation. To date, antiferromagnetic-type propagating spin waves excitation and manipulation have remained challenging. Here, we demonstrate current-controlled stripe domains with alternating upward and downward magnetization in La_0.67Sr_0.33MnO₃ thin films, which host spin-wave propagation. A high-frequency mode around 10 GHz higher than the ordinary low-frequency modes is observed and the dispersion of this mode is different from the low-frequency ones. We developed a theoretical model based on two oppositely oriented coupled domains, which accounts the high-frequency mode an effective antiferromagnetic spin-wave mode. The spin waves can even propagate at zero magnetic field, with group velocities of 2.6 km s^-1. The orientation of the stripe domains can be controllably modified by an electric current pulse with a density of only 10⁵ A cm^-2, which opens up perspectives for reconfigurable magnonic devices [1,2].

[1] C. Liu, S. Wu, J. Zhang, J. Chen, J. Ding, J. Ma, Y. Zhang, Y. Sun, S. Tu, H. Wang, P. Liu, C. Li, Y. Jiang, P. Gao, D. Yu, J. Xiao, R. Duine, M. Wu, C.-W. Nan, J.-X. Zhang and H. Yu, Current-controlled propagation of spin waves in antiparallel, coupled domains, Nat. Nanotechnol. 14, 691-697 (2019).
[2] H. Yu, J. Xiao and H. Schultheiss, Magnetic texture based magnonics. Phys. Rep. 905, 1-59 (2021).