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The viscous Gilbert damping parameter governing magnetization dynamics is ofprimary importance for various spintronics applications. Although, the dampingconstant is believed to be anisotropic by theories. It is commonly treated as ascalar due to lack of experimental evidence. Here, we present an elaborateangle dependent broadband ferromagnetic resonance study of high qualityepitaxial La$_{0.7}$Sr$_{0.3}$MnO$_{3}$ films. Extrinsic effects are suppressedand we show convincing evidence of anisotropic damping with twofold symmetry atroom temperature. The observed anisotropic relaxation is attributed to themagnetization orientation dependence of the band structure. In addition, wedemonstrated that such anisotropy can be tailored by manipulating the stain.This work provides new insights to understand the mechanism of magnetizationrelaxation.

Anisotropic Gilbert damping in perovskite La$_{0.7}$Sr$_{0.3}$MnO$_{3}$ thin film