Current-Manipulated Propagation of Spin Waves in Antiparallel Coupled Stripe Domains of La0.67Sr0.33MnO3 Thin Films
Haiming Yu, Beihang University
May 27, 2022
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 La0.67Sr0.33MnO3 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].
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