The two-dimensional antiferromagnetic material CrSBr has attracted significant attention due to its unique electrical, optical, and magnetic properties. Previous studies have reported different magnetic resonances in bulk CrSBr samples but left the damping rates of these resonances unexplored, due to the ultraweak nature of the signals. In this study, we optimize the design of a coplanar waveguide and systematically investigate the variation in internal damping rates of magnetic resonances in a CrSBr sample under different magnetization states. Given that CrSBr is sensitive to both temperature and magnetic field, we develop three distinct methods to modify its magnetization: altering the bias magnetic field, varying temperature, and applying a temperature gradient. We find that the internal damping rates of the antiferromagnetic resonance and the ferromagnetic resonance exhibit opposite dependence on either the bias magnetic field or temperature. We attribute these changes to the nonuniform magnetization of the CrSBr sample. To support this hypothesis, we perform an additional experiment applying a temperature gradient to induce nonuniform magnetization. The results confirm our assumption that the temperature gradient enhances the nonuniform magnetization and increases the internal damping rates of the magnetic resonances. Our work reveals the connection between damping and magnetization states in van der Waals magnetic magnets. These findings may contribute to the study of dynamic magnetization properties in van der Waals magnetic materials.

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• Magnetization dynamics
• Spin dynamics
• Spintronics