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Barkhausen noise in disordered ferromagnets is typically understood tooriginate primarily from jerky field-driven motion of domain walls. We studythe magnetization reversal process in disordered permalloy thin films usingmicromagnetic simulations, and find that the magnetization reversal processconsists of gradual formation of immobile 360$^{\circ}$ domain walls via asequence of localized magnetization rotation events. The density of360$^{\circ}$ domain walls formed within the sample as well as the statisticalproperties of the Barkhausen jumps are controlled by the disorder strength.

Barkhausen noise from formation of 360$^{\circ}$ domain walls in disordered permalloy thin films