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In a previous letter1 it was shown that in double Permalloy films, consisting of two Permalloy layers separated by a nonmagnetic layer, wall structures occur which differ from those observed in single films. In particular, in a double film (400 Å Ni-Fe, 200 Å SiO, 400 Å Ni-Fe) NCel walls and perturbation walls were observed instead of the cross-tie walls normally occurring in Ni-Fe layers of 400 Å.
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