Inertial effects in magnetic relaxation dynamics remain an experimentally unexplored aspect of condensed matter systems with few examples reported in spin ice and ferrofluid compounds. In this work, we examine the relaxation dynamics in chiral magnet ${\mathrm{Co}}_8{\mathrm{Zn}}_7{\mathrm{Mn}}_5$ across magnetic phases. Conventional Debye and Cole-Cole models fail to capture the frequency dependence of ac susceptibility across different magnetic phases, whereas incorporating an inertial component successfully describes the dynamics thereby yielding a consistent relaxation time (τ) of ${10}^{-5}$ s for ${\mathrm{Co}}_8{\mathrm{Zn}}_7{\mathrm{Mn}}_5$. The field-dependent variation of τ exhibits a nonmonotonic nature, with the double-peak-like structure at the skyrmion phase transitions. Our results reveal the presence of inertial effect in magnetic relaxation behavior of β-Mn type Co-Zn-Mn compounds. We demonstrate that the inertial effect is an intrinsic property of β-Mn type Co-Zn-Mn compounds that is independent of any particular magnetic phase. We qualitatively argue that spin fluctuation is the most plausible cause for inertial effects in chiral magnets.

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• Magnetic order
• Magnetization dynamics
• Skyrmions
• AC susceptibility measurements