Domain Boundary Configurations during Magnetization Reversals

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Abstract
The signal resulting from the application of an alternating field while a magnetization reversal is taking place yields information about the total domain boundary area contributing to the reversal at each moment. This technique is used to show that the variation in rate during a reversal in a 65 Permalloy tape core corresponds to changes in the area of moving domain boundary, whereas in a 3¼% silicon-iron single crystal picture frame specimen the area of moving domain boundary remains approximately constant, and variations in reversal rate therefore correspond to variations in velocity.