Current-manipulated propagation of spin waves in antiparallel coupled stripe domains of La 0.67 Sr 0.33 MnO 3 thin films

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 0.67 Sr 0.33 MnO 3 thin films, which host
spin-wave propagation. A 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 10 5 A cm -2 ,
which opens up perspectives for reconfigurable magnonic devices[1].

[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, H.
Yu, Current-controlled propagation of spin waves in antiparallel, coupled domains.
Nat. Nanotechnol. 14, 691-697 (2019).