We suggest using spatially modulated strain for control of a spin wave propagating inside a bulk magnet. The modulation with the wave vector $\mathit{q}=2\mathit{k}$, by virtue of magnetoelasticity, mixes spin waves with wave vectors near $\mathit{k}$ and $-\mathit{k}$. This leads to lifting the degeneracy of the symmetric and antisymmetric eigenstate combinations of these waves. The resulting picture reminds one of a tunneling particle in a symmetric double-well potential. Here, a moving spin wave being subjected to $2\mathit{k}$-lattice modulation after some time alters its propagation direction to the opposite one, and so on. The effect can be utilized for the control of the spin-wave propagation, which can be useful for spintronic and magnonic applications. The control may include a delay line element, filtering, and waveguide of the spin waves.

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• Exchange interaction
• Magnetoelastic effect
• Spin waves
• Antiferromagnets