Abstract
We have investigated the interactions of magnetic domain walls with precipitates, dislocations, and grain boundaries in Ferrovac iron foils by means of Lorenz electron microscopy. Our results show that dislocations and grain boundaries do not significantly impede domain wall motion compared to precipitates and holes. Also, our results support the concept of nucleation of spike domains of reverse magnetization from grain boundaries, the nucleation energy being found equal to or less than 1.3-Oe applied field. Photographs are presented of both single-spike and double-spike domain configurations at grain boundaries.
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