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Spin electromagnetic fields driven by the Rashba spin-orbit interaction, orRashba-induced spin Berry's phase, in ferromagnetic metals is theoreticallystudied based on the Keldysh Green's function method. Considering a limit ofstrong sd coupling without spin relaxation (adiabatic limit), the spin electricand magnetic fields are determined by calculating transport properties. Thespin electromagnetic fields turn out to be expressed in terms of aRashba-induced effective vector potential, and thus they satisfy the Maxwell'sequation. In contrast to the conventional spin Berry's phase, theRashba-induced one is linear in the gradient of magnetization profile, and thuscan be extremely large even for slowly varying structures. We show that theRashba-induced spin Berry's phase exerts the Lorentz force on spin resulting ina giant spin Hall effect in magnetic thin films in the presence ofmagnetization structures. Rashba-induced spin magnetic field would be useful todistinguish between topologically equivalent magnetic structures.

Rashba-induced spin electromagnetic fields in a strong sd coupling regime