However, the exact values are hard to be determined since multiple values can all well fit the experimental results (Figure S4)

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direction. However, the exact values are hard to be determined since multiple values can all well fit the experimental results (Figure S4). 22 Figure S3. Low-field losses fitting. (a, b) Resonance half linewidth as a function of RF frequency from 8 to 40 GHz measured with 𝜑ு = 30o and 60o. The solid lines represent the best fitting curves with eq. (S1). (c) The temperature-dependent effective Gilbert damping obtained from Low-field losses fitting, which are similar to those obtained using linear fitting method. 23 Figure S4. Low-filed losses fitting of the effective Gilbert damping along [001]. (a) Half linewidth as a function of RF resonance frequency of [001] direction at various temperatures. (b, c) The failed trials to determine the effective Gilbert damping values at T = 50 K and 2 K using eq. (S1). 24 III: Supporting data from additional sample Figure S5 summarizes effective Gilbert damping results obtained from another 170 nm CrO2 thin film. Clearly, a larger effective Gilbert damping is observed when the magnetic field is along the [010] direction, and a smaller damping is observed when the magnetic field is along 𝜑ு = 60° direction. As the temperature decreases, the dampin