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We present a Barkhausen pulse (BP) shape fitting method that allows extracting the domain wall velocities during a given fast domain shape transformation after merging during switching in lithium niobate. Two scenarios of hexagonal domain merging were distinguished: for domains with comparable sizes, and for large and small domains. The fitting was based on the knowledge about domain wall types and delay time of the external circuit. The derived expressions were successfully used for fitting the shapes of experimentally obtained BPs. Proposed fitting allowed extracting the velocities of fast and superrfast domain walls with high accuracy.

Analysis of Barkhausen pulse shapes in lithium niobate single crystals