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The magnetization reversal in stripe-like exchange bias patterned $\rmNi_{81}Fe_{19}/IrMn$ thin films was investigated by complementary inductive andhigh resolution magneto optical magnetometry, magneto optical Kerr microscopy,and polarized neutron reflectometry to clarify the effects of competinginterfacial exchange bias and lateral interface contributions. Structures ofvarying ferromagnetic layer thickness and stripe period were analyzedsystematically at the frozen-in domain state of oppositely aligned stripemagnetization. For all samples the mean magnetization of the magnetic hybridstructures was found to be aligned nearly orthogonally with respect to thestripe axis and the set exchange bias direction. Due to the interaction ofinterfacial coupling, exchange, and magneto-static energy contributions, theopening angle of neighboring stripe magnetizations increases with decreasingferromagnetic layer thickness and increasing stripe period. The experimentalobservations are in agreement with an earlier proposed model for designingmicro-patterned exchange bias films.

Competing magnetic interactions in exchange bias modulated films