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Tailoring Gilbert damping of metallic ferromagnetic thin films is one of thecentral interests in spintronics applications. Here we report a giant Gilbertdamping anisotropy in epitaxial Co$_{50}$Fe$_{50}$ thin film with amaximum-minimum damping ratio of 400 \%, determined by broadband spin-torque aswell as inductive ferromagnetic resonance. We conclude that the origin of thisdamping anisotropy is the variation of the spin orbit coupling for differentmagnetization orientations in the cubic lattice, which is further corroboratefrom the magnitude of the anisotropic magnetoresistance in Co$_{50}$Fe$_{50}$.

Giant anisotropy of Gilbert damping in epitaxial CoFe films