Theory of magnetoelastic resonance in a mono-axial chiral helimagnet

TL;DR

This paper investigates magnetoelastic resonance in a mono-axial chiral helimagnet, revealing hybridization of elastic and spin waves, non-reciprocal spectra, and potential for polarization conversion based on chirality.

Contribution

It provides a theoretical analysis of magnetoelastic resonance phenomena, including hybridization and non-reciprocity, in mono-axial chiral helimagnets, which was not previously detailed.

Findings

Hybridization of elastic and spin waves depends on chirality.

The conical phase shows significant non-reciprocity.

The soliton lattice phase exhibits multi-resonance behavior.

Abstract

We study magnetoelastic resonance phenomena in a mono-axial chiral helimagnet belonging to hexagonal crystal class. By computing the spectrum of coupled elastic wave and spin wave, it is demonstrated how hybridization occurs depending on their chirality. Specific features of the magnetoelastic resonance are discussed for the conical phase and the soliton lattice phase stabilized in the mono-axial chiral helimagnet. The former phase exhibits appreciable non-reciprocity of the spectrum, the latter is characterized by a multi-resonance behavior. We propose that the non-reciprocal spin wave around the forced-ferromagnetic state has potential capability to convert the linearly polarized elastic wave to circularly polarized one with the chirality opposite to the spin wave chirality.