Theory of magnetoelastic resonance in a monoaxial chiral helimagnet

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 nonreciprocal 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.

Skyrmion interactions and lattices in chiral magnets: analytical results

“…This leads to the possibility of the ground state being an inhomogeneous skyrmion lattice in agreement with numerical studies [15,16]. The other possible inhomogeneous state is a spiral or helical state [18,19] where the configuration is effectively one dimensional.…”

“…interacting closely packed skyrmions has been considered in [17]. Spiral or helical states have also been studied as effectively one-dimensional inhomogeneous states [18,19].…”

Tensile deformations of the magnetic chiral soliton lattice probed by Lorentz transmission electron microscopy

“…A change of the electron phase second derivative under the effect of a magnetic field occurs entirely inside the 2s-phase at [73] implemented in the fpd library [74] using a density of 5.03 g/cm 3 [38], giving an inelastic mean free path of 126 nm. The convergence and collection semi-angles were 29 mrad and 36 mrad, respectively.…”

“…Magnetostrictive deformations in the monoaxial chiral helimagnet were addressed in Refs. [36][37][38], however, the emphasis of these studies was on the spectrum of coupled magnetoelastic waves. In those treatments, inhomogeneous deformations induced in the crystal by the magnetic background are accounted for, but the reverse effect of the elastic subsystem on magnetic ordering is ignored.…”

Chirality-Induced Phonon Dispersion in a Noncentrosymmetric Micropolar Crystal

“…A salient feature of the nonreciprocity is a polarizationdependent splitting of phonon bands similar to the one for electronic bands due to spin-orbit coupling [13]. In contrast to the phonon magnetochiral effect [14,15], for which the splitting is achieved through coupling with nonreciprocal magnons, our aim is to find the result for a purely phononic sector without the involvement of any subsystem outside.…”