  We consider the effect of a multiple magnetic domain structure in a
superconductor/ferromagnet bilayer, modeled by a ferromagnetic layer with a
rotating magnetic moment. The domain walls in this model are of equal size as
the domains, and are of Neel type. We study the superconducting critical
temperature as a function of the rotation wavelength of the magnetic moment.
The critical temperature of the bilayer is found to be always enhanced by the
domain structure, and exhibits an interesting reentrant behavior. We suggest
that this effect can be used for a new device where superconductivity may be
controlled by the domain structure of the magnetic layer.
