Barkhausen noise from formation of360∘domain walls in disordered permalloy thin films

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Micromagnetic simulations reveal formation of 360${}^{\ensuremath{\circ}}$ domain walls in disordered, thin permalloy films during the field-driven magnetic reversal process. With stronger disorder, the reversal process is increasingly governed by discontinuous jumps, resulting in Barkhausen noise without explicit domain wall movement.