Magnetoelastic coupling between surface acoustic waves (SAWs), spin waves, and magnetic textures enables tunable magnetoacoustic functionality. Synthetic antiferromagnets (SAFs) provide a suitable platform owing to their adjustable SW spectra and negligible stray fields. Here we investigate how a Bloch-type domain wall (DW) in a CoFeB/Ru/CoFeB SAF modifies SAW propagation. Analytical modeling and micromagnetic simulations show that SAWs in the nonuniform SAF decompose into three magnetoelastic eigenmodes. Near the magnetoelastic resonance, the SAW transmission across the DW displays pronounced frequency-dependent oscillations. We trace this behavior to interference among the eigenmodes, rather than the conventional picture of a DW acting simply as a scattering barrier. These findings identify an interference mechanism in magnetoacoustic transport and point to a route toward frequency-tunable SAW devices based on magnetic domain structures.

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• Domain walls
• Magnetization dynamics
• Magnetoacoustic effect
• Magnetoelastic effect
• Micromagnetism
• RKKY interaction
• Spin waves
• Magnetic thin films
• Synthetic antiferromagnetic multilayers
• Landau-Lifschitz-Gilbert equation
• Micromagnetic modeling