Helical spin dynamics in Cu${}_2$OSeO${}_3$ as measured with small-angle neutron scattering

Abstract

The insulating chiral magnet Cu${}_2$OSeO${}_3$ exhibits a rich array of low-temperature magnetic phenomena, making it a prime candidate for the study of its spin dynamics. Using spin wave small-angle neutron scattering (SWSANS), we systematically investigated the temperature-dependent behavior of the helimagnon excitations in the field-polarized phase of Cu${}_2$OSeO${}_3$. Our measurements, spanning 5-55 K, reveal the temperature evolution of spin-wave stiffness and damping constant with unprecedented resolution, facilitated by the insulating nature of Cu${}_2$OSeO${}_3$. These findings align with theoretical predictions and resolve discrepancies observed in previous studies, emphasizing the enhanced sensitivity of the SWSANS method. The results provide deeper insights into the fundamental magnetic properties of Cu${}_2$OSeO${}_3$, contributing to a broader understanding of chiral magnets.

References in corpus (19)

• Skyrmion Lattice in a Chiral Magnet
• A new class of chiral materials hosting magnetic skyrmions beyond room temperature
• Long wavelength helimagnetic order and skyrmion lattice phase in Cu2OSeO3
• Observation of two independent skyrmion phases in a chiral magnetic material
• The quantum origins of skyrmions and half-skyrmions in Cu2OSeO3
• New magnetic phase of the chiral skyrmion material Cu2OSeO3
• Low spin wave damping in the insulating chiral magnet Cu${}_2$OSeO${}_3$
• Thermodynamic evidence of a second skyrmion lattice phase and tilted conical phase in Cu${}_2$0SeO${}_3$
• Magnon spectrum of the helimagnetic insulator Cu2OSeO3
• Microwave spectroscopy of the low-temperature skyrmion state in Cu2OSeO3
• Ab initio analysis of magnetic properties of prototype B20 chiral magnet FeGe
• Spin-wave dynamics in FeGe helimagnet: studied by small-angle neutron scattering
• Ferromagnetic resonance with magnetic phase selectivity by means of resonant elastic x-ray scattering on a chiral magnet
• Spin excitations in the skymion host Cu2OSeO3
• Low energy magnons in the chiral ferrimagnet ${\text{Cu}}_2{\text{OSeO}}_3$: a coarse-grained approach
• Spin wave stiffness and damping in a frustrated chiral helimagnet Co${}_8$Zn${}_8$Mn${}_4$ as measured by small-angle neutron scattering
• Direct observation of the exchange anisotropy in the helimagnetic insulator Cu${}_2$OSeO${}_3$
• Imaging magnetic spiral phases, skyrmion clusters, and skyrmion displacements at the surface of bulk Cu${}_2$OSeO${}_3$
• Observation of distorted tilted conical phase at the surface of a bulk chiral magnet with resonant elastic x-ray scattering