Magneto-optic measurements have been performed to study the magnetic response of Co/Al₂O₃/Co tunnel junctions with the aim to show the domain duplication of the hard magnetic layer into the soft magnetic layer. The magnetization reversals of the hard and the soft layer have been studied separately and their ferromagnetic coupling is shown when combined in a tunnel junction. Features appearing in the variation of tunnel resistance as a function of applied field are associated to the domain phase evolution of each electrode and a deep understanding of the domain duplication is given.
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Lenoble et al. (2001) studied this question.
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