Low spin wave damping in the insulating chiral magnet Cu${}_2$OSeO${}_3$

Abstract

Chiral magnets with topologically nontrivial spin order such as Skyrmions have generated enormous interest in both fundamental and applied sciences. We report broadband microwave spectroscopy performed on the insulating chiral ferrimagnet Cu${}_2$OSeO${}_3$. For the damping of magnetization dynamics we find a remarkably small Gilbert damping parameter of about $1\times 10^{-4}$ at 5 K. This value is only a factor of 4 larger than the one reported for the best insulating ferrimagnet yttrium iron garnet. We detect a series of sharp resonances and attribute them to confined spin waves in the mm-sized samples. Considering the small damping, insulating chiral magnets turn out to be promising candidates when exploring non-collinear spin structures for high frequency applications.

arXiv comment5 pages, 5 figures, and supplementary material

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Cited by in corpus (28)

• The 2020 Skyrmionics Roadmap
• Magnetic texture based magnonics
• Thermodynamic evidence of a second skyrmion lattice phase and tilted conical phase in Cu${}_2$0SeO${}_3$
• Microwave spectroscopy of the low-temperature skyrmion state in Cu2OSeO3
• Helimagnon resonances in an intrinsic chiral magnonic crystal
• Weak crystallization of fluctuating skyrmion textures in MnSi
• Quantum Damping of Skyrmion Crystal Eigenmodes due to Spontaneous Quasiparticle Decay
• Magnon-photon coupling in a non-collinear magnetic insulator Cu${}_2$OSeO${}_3$
• Linearly polarized GHz magnetization dynamics of spin helix modes in the ferrimagnetic insulator Cu${}_2$OSeO${}_3$
• Ferromagnetic resonance with magnetic phase selectivity by means of resonant elastic x-ray scattering on a chiral magnet
• Solitary wave excitations of skyrmion strings in chiral magnets
• Magnetoelectric Cavity Magnonics in Skyrmion Crystals
• Imaging the ultrafast coherent control of a skyrmion crystal
• Nonreciprocal Phonon Propagation in a Metallic Chiral Magnet
• Observation of a new light-induced skyrmion phase in the Mott insulator Cu2OSeO3
• Ferromagnetic domain wall as a nonreciprocal string
• Chiral standing spin waves in skyrmion lattice
• Tunable Cooperativity in Coupled Spin--Cavity Systems
• Confined dipole and exchange spin waves in a bulk chiral magnet with Dzyaloshinskii-Moriya interaction
• Controllable inter-skyrmion attractions and resulting skyrmion-lattice structures in two-dimensional chiral magnets with in-plane anisotropy
• Short-wave magnons with multipole spin precession detected in the topological bands of a skyrmion lattice
• Growth and helicity of non-centrosymmetric Cu${}_2$OSeO${}_3$ crystals
• Hybrid magnetization dynamics in ${\text{Cu}}_{\text{2}}{\text{OSeO}}_{\text{3}}$/$\mathrm{NiFe}$ heterostructures
• Cu2OSeO3 Turns Trigonal with Structural Transformation and Implications for Skyrmions
• Observation of distorted tilted conical phase at the surface of a bulk chiral magnet with resonant elastic x-ray scattering
• Helical spin dynamics in Cu${}_2$OSeO${}_3$ as measured with small-angle neutron scattering
• Cubic magnetic anisotropy in $B$20 magnets: Interplay of anisotropy and magnetic order in Fe${}_{1-x}$Co${}_x$Si
• Longitudinal magnon transport properties in the easy-axis XXZ Heisenberg ferromagnet on the face-centered cubic lattice