Spin-wave`s dynamics in antiferromagnets controlled by an electric field: a phenomenological approach*

Implementation of spin waves (SWs) in the magnonic devices is desirable as they propagate without Joule heating and thus ensure low energy consumption. One of the ways is to use nonreciprocity in the propagation SWs in opposite directions. This can be achieved in chiral magnets with breaking inversion symmetry or in nonchiral magnets by applying an external static electric field [1-2]. Potentially, the latter option may have a wider choice of magnetic materials. For practical applications, it is important to figure out how to tune SW`s dynamics by a static electric field generating the Dzyaloshinskii-Moriya interaction (DMI). In this context, we study the two-sublattice antiferromagnet within the phenomenological approach based on the Landau-Lifshitz-Gilbert equation. It is shown that the DMI makes the SWs spectra asymmetrical concerning the wave vector, and the asymmetry level grows with an increasing electric field. The obtained results may be important for describing periodic magnetic structures and constructing a spin wave field-effect transistor [3].

[1] Tianyu Liu and G. Vignale, Phys. Rev. Lett. 106, 247203 (2011).

[2] A.S. Savchenko and V.N. Krivoruchko, J. Magn. Magn. Mater., 474, 9-13 (2019).

[3] R. Cheng et al., Sci Rep 6, 24223 (2016).