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

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author Che Ping, Stasinopoulos Ioannis, Mucchietto Andrea, Li Jianing, Berger Helmuth, Bauer Andreas, Pfleiderer Christian, Grundler Dirk,
Project Discovery and Nanoengineering of Novel Skyrmion-hosting Materials
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Original article (peer-reviewed)

Journal Physical Review Research
Volume (Issue) 3(3)
Page(s) 033104 - 033104
Title of proceedings Physical Review Research
DOI 10.1103/physrevresearch.3.033104

Open Access

URL http://doi.org/10.1103/PhysRevResearch.3.033104
Type of Open Access Publisher (Gold Open Access)

Abstract

The Dzyaloshinskii-Moriya interaction (DMI) has an impact on excited spin waves in the chiral magnet Cu2OSeO3 by means of introducing asymmetry in their dispersion relations. The confined eigenmodes of a chiral magnet are hence no longer the conventional standing spin waves. Here we report a combined experimental and micromagnetic modeling study by broadband microwave spectroscopy, and we observe confined spin waves up to eleventh order in bulk Cu2OSeO3 in the field-polarized state. In micromagnetic simulations we find similarly rich spectra. They indicate the simultaneous excitation of both dipole- and exchange-dominated spin waves with wavelengths down to (47.2±0.05) nm attributed to the exchange interaction modulation. Our results suggest the DMI to be effective in creating exchange spin waves in a bulk sample without the challenging nanofabrication and thereby in exploring their scattering with noncollinear spin textures.
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