We report experiments on the interlayer exchange coupling in epitaxial Fe/Al/Fe structures. The total coupling is as high as 3 mJ/m2 and leads to the formation of a partial domain wall in the ferromagnetic films parallel to the interfaces due to the competition between the torques excerted by the interlayer coupling and the external field. Using micromagnetic calculations to simulate magnetizations loops and Brillouin light scattering spectra we show that the twisted state results in higher saturation fields than expected for coupled uniform films. Hence, for strongly coupled systems the twisted state must be taken into account to reliably determine interlayer coupling constants.