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Multiple intriguing low temperature phenomena have recently been discoveredin the family of chiral cubic Co-Zn-Mn compounds with $\beta-$Mn-typestructure. In particular, Co$_8$Zn$_8$Mn$_4$ displays a reduction of thehelical spiral pitch on cooling, along with lattice shape transformations ofmetastable skyrmions and the manifestation of peculiar magnetic textures due tostrong magnetocrystalline anisotropy. Here we report on temperature-dependentmeasurements of helimagnon excitations in the field polarized regimeCo$_8$Zn$_8$Mn$_4$ using the spin wave small-angle neutron scattering (SWSANS)technique. By applying a new analytical expression to interpret the data,quantitative estimates for both spin wave stiffness and damping are extractedacross a wide temperature range between 70 K and 250 K. We speculate that theirnon-trivial temperature-dependencies arise due to the effects of magneticfrustration arising from Mn magnetic moments, which is further reflected incontinuous variations of both exchange and Dzyaloshinskii-Moriya interactions.

Spin wave stiffness and damping in a frustrated chiral helimagnet Co$_8$Zn$_8$Mn$_4$ as measured by small-angle neutron scattering