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We propose a model composed of spin-polarized itinerant electrons and bosonic spin-wave excitations,and study renormalization of the spin-polarized itinerant electron bands due to electron-magnon scattering.svin-polarized kink structures are predicted in the normal state quasiparticle dynamics of ferromagnetic superconductor as UGe2.It is suggested that the angle-resolved photoemission experiment may be helpful in this respect.