The hysteresis loops of individual domain walls and domain-wall motion in grain-oriented 3% Si-Fe

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Abstract
The Kerr magneto-optical effect has been used to study the very low-frequency hysteresis loops of individual 180° domain walls in grain-oriented Si-Fe sheet. Measurements on a number of walls show that the loops vary widely in shape and show similar non-repeatable properties to those reported previously at higher frequencies. The peak movement appears to be independent of the coercive force of the walls, suggesting a model for wall motion in which the retarding forces on the wall due to a combination of magnetostatic fields and imperfections.