Thermal evolution of exchange stiffness and Gilbert damping in magnetic Weyl semimetal Co 2 MnGa thin films

Magnetic Weyl semimetals such as Co2MnGa (CMG) are promising candidates for next-generation spintronic materials due to their exotic topological properties. Using ferromagnetic resonance spectroscopy, the authors investigate CMG thin films, revealing that the thermal evolution of the exchange stiffness is dominated by electron-magnon interactions. Furthermore, they demonstrate ultralow damping at room temperature in all the films, with the thickest film showing a temperature-independent damping behavior down to 10 K. These results highlight CMG's potential for efficient room\leavevmode\hbox{-}temperature and cryogenic magnonic circuits and provide critical parameters for micromagnetic modeling to support device engineering.