Exchange coupling and macroscopic domain structure in a wedged permalloy/FeMn bilayer

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Abstract
Local Kerr effect and magnetometry measurements reveal that switching in exchange-coupled wedged-permalloy/FeMn bilayers involves only two macroscopic domains, extending across the entire sample, separated by a 180° domain wall, which moves along the wedge direction. The squareness of the hysteresis loop of such exchange-coupled layers depends on the thickness variation of the sample under measurement.