We investigate magnetization dynamics and spin-charge conversion in $\mathrm{NiFe}/{\mathrm{MnBi}}_2{\mathrm{Te}}_4$ heterostructures using broadband, temperature-resolved ferromagnetic resonance spectroscopy and inverse spin-Hall effect (ISHE) measurements over the 20–290 K range. A Landau-Lifshitz-Gilbert-based model simultaneously fits the temperature-dependent effective Gilbert damping ${\alpha }_{\mathrm{eff}}$ and the ISHE voltage, yielding the spin-Hall angle ${\theta }_{\mathrm{ISHE}}$. We find that ${\theta }_{\mathrm{ISHE}}$ remains nearly constant ($\approx 0.12–0.3$) at approximately 120–130 K. Above this temperature, ${\alpha }_{\mathrm{eff}}$ and $V_{\mathrm{ISHE}}$ decouple: the voltage drops while the damping increases, indicating that parasitic spin-rectification and a slight temperature drift of intrinsic NiFe damping dominate the signal and obscure direct spin-charge conversion. These results establish $\mathrm{Mn}{\mathrm{Bi}}_2{\mathrm{Te}}_4$ as a robust platform for low-temperature spintronics and define the thermal boundaries above which secondary voltage contributions must be carefully managed.

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• Inverse spin Hall effect
• Magnetism
• Spintronics
• Ferromagnets
• Heterostructures
• Topological insulators
• Ferromagnetic resonance