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.

5 pages, 5 figures, and supplementary material

References in corpus (6)

• Strongly coupled magnons and cavity microwave photons
• Hybridizing ferromagnetic magnons and microwave photons in the quantum limit
• High Cooperativity Cavity QED with Magnons at Microwave Frequencies
• Long wavelength helimagnetic order and skyrmion lattice phase in Cu2OSeO3
• Formation and rotation of skyrmion crystal in the chiral-lattice insulator Cu2OSeO3
• Ferrimagnetism of the magnetoelectric compound Cu${}_2$OSeO${}_3$ probed by ${}^{77}$Se NMR

Cited by in corpus (14)

• 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
• Weak crystallization of fluctuating skyrmion textures in MnSi
• Magnetoelectric Cavity Magnonics in Skyrmion Crystals
• Nonreciprocal Phonon Propagation in a Metallic Chiral Magnet
• Observation of a new light-induced skyrmion phase in the Mott insulator Cu2OSeO3
• Chiral standing spin waves in skyrmion lattice
• Short-wave magnons with multipole spin precession detected in the topological bands of a skyrmion lattice
• 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
• Longitudinal magnon transport properties in the easy-axis XXZ Heisenberg ferromagnet on the face-centered cubic lattice
• Cubic magnetic anisotropy in $B$20 magnets: Interplay of anisotropy and magnetic order in Fe${}_{1-x}$Co${}_x$Si