Spin-wave spectroscopy on Dzyaloshinskii-Moriya interaction in room-temperature chiral magnets hosting skyrmions

Abstract

Propagation character of spin wave was investigated for chiral magnets FeGe and Co-Zn-Mn alloys, which can host magnetic skyrmions near room temperature. On the basis of the frequency shift between counter-propagating spin waves, the magnitude and sign of Dzyaloshinskii-Moriya (DM) interaction were directly evaluated. The obtained magnetic parameters quantitatively account for the size and helicity of skyrmions as well as their materials variation, proving that the DM interaction plays a decisive role in the skyrmion formation in this class of room-temperature chiral magnets. The propagating spin-wave spectroscopy can thus be an efficient tool to study DM interaction in bulk single-phase compounds. Our results also demonstrate a function of spin-wave diode based on chiral crystal structures at room temperature.

19 pages, 4 figures, 1 table (Supplementary Material included)

References in corpus (4)

• Spontaneous Skyrmion Ground States in Magnetic Metals
• A new class of chiral materials hosting magnetic skyrmions beyond room temperature
• Direct observation of the Dzyaloshinskii-Moriya interaction in a Pt/Co/Ni film
• Magnon dispersion shift in the induced-ferromagnetic phase of the noncentrosymmetric MnSi

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• Pinning of Helimagnetic Phase Transitions in Zn-Substituted Skyrmion Host Cu${}_2$OSeO${}_3$
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• Topological melting of the metastable skyrmion lattice in the chiral magnet Co${}_9$Zn${}_9$Mn${}_2$
• Dzyaloshinskii-Moriya interaction in strongly spin-orbit-coupled systems: General formula and application to topological and Rashba materials
• Lagrangian formulation for emergent elastic waves in magnetic emergent crystals
• Deterministic strain-control of stability and current-induced motion of skyrmions in chiral magnets
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• Inducing Skyrmion Flop Transitions in Co${}_8$Zn${}_8$Mn${}_4$ at Room Temperature