Domain Wall Energy Measurements using Narrow Permalloy Strips

Middelhoek
¹
proposed in 1961 that the domain structure of narrow thin film strips could be used to measure energies of domain walls and Kuwahara et al. have likewise suggested this method.
²
When measurements were attempted by these authors it was found that experimental results of wall energy were about a factor of four lower than calculated values. Furthermore, and contrary to theoretical calculations, there was no variation of wall energy density with film thicknes.
²
This note proposes improvements in the experimental procedure, and reportss ome results which resolve the inconsistencies in the literature.