A tunnel magnetoresistance signal is used for probing the relative orientations of the local magnetization in the two magnetic electrodes of a tunnel junction. Minor magnetoresistance loops are studied as a function of the return field in order to change the domain configuration of the hard layer. Domain structure duplication of the hard layer template into the soft layer is observed. This effect is shown to be driven by the magnetic anisotropy of the hard layer. Reducing this anisotropy leads to domain duplication but with effects nondiscernible in the tunnel magnetoresistance ~TMR! signal. However, a signature of the 360° domain walls is then observed on the TMR signal.