Abstract
We have studied, by means of numerical simulation, the structure of domain walls in permalloy thin film monolayers and sandwiches consisting of two permalloy layers separated by a Cu interlayer. The calculated transition thicknesses between Bloch and Néel domain walls increase notably for the sandwiches with respect to monolayers. The structures obtained for uncoupled walls show quite similar patterns for the Néel walls and their corresponding quasi-walls. When coupled, the quasi-walls disappear and so the energy of the pair is reduced approximately to half the energy of the uncoupled pair. Results have been tested in thin film permalloy sandwiches obtained from a sputtering system.
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