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The Dzyaloshinskii-Moriya interaction (DMI) has an impact on excited spinwaves in the chiral magnet Cu$_2$OSeO$_3$ by means of introducing asymmetry ontheir dispersion relations. The confined eigenmodes of a chiral magnet arehence no longer the conventional standing spin waves. Here we report a combinedexperimental and micromagnetic modeling study by broadband microwavespectroscopy we observe confined spin waves up to eleventh order in bulkCu$_2$OSeO$_3$ in the field-polarized state. In micromagnetic simulations wefind similarly rich spectra. They indicate the simultaneous excitation of bothdipole- and exchange-dominated spin waves with wavelengths down to (47.2 $\pm$0.05) nm attributed to the exchange interaction modulation. Our results suggestDMI to be effective to create exchange spin waves in a bulk sample without thechallenging nanofabrication and thereby to explore their scattering withnoncollinear spin textures.

Confined dipole and exchange spin waves in a bulk chiral magnet with Dzyaloshinskii-Moriya interaction