We suggest using spatially modulated strain for control of a spin wave propagating inside a bulk magnet. The modulation with the wave vector q=2k, by virtue of magnetoelasticity, mixes spin waves with wave vectors near k and −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 the 2k-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 that can be useful for spintronic and magnonic applications. The control may include a delay line element, filtering, and waveguide of the spin waves.
@article{arxiv.2201.02691,
title = {Control of spin waves by spatially modulated strain},
author = {Ankang Liu and Alexander M. Finkel'stein},
journal= {arXiv preprint arXiv:2201.02691},
year = {2022}
}