Abstract
In the present work we give an overview on the domain‐wall dynamics in amorphous glass‐coated microwires with positive magnetostriction. They are characterized by a peculiar domain structure that allows us to study the magnetization process of a single domain wall. The domain‐wall dynamics is characterized by at least 4 regimes. At low field, the interaction of the domain wall with the defects is observed that is characteristic for the adiabatic regime. At medium field, the domain wall moves in a viscous regime, where the domain‐wall velocity is proportional to the applied magnetic‐field amplitude. At higher fields, the domain‐wall mobility steeply increases as a result of the change of the domain‐wall structure. Finally, the domain wall reaches very high velocities, four times higher than the sound velocity measured in microwires. In some cases, the Walker limit is observed in this range. Moreover, the interaction of the domain wall with phonons was observed when the domain wall approaches the sound velocity. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)