The Dependence of Power Loss on Domain Wall Motion

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Abstract
The cause of the anomalous loss in soft magnetic materials has often been attributed in the published literature to domain wall pinning. An experimental program has been carried out to assess the change in power loss caused by the introduction of pinning points. The domain wall motion and localised power loss have been measured for individual grains in polycrystalline commercial material and for single crystals of 3% grain‐oriented silicon‐iron. The orientation of both types of specimen was (110) [001]. Domain wall pinning points, in the form of scratches or holes, were then introduced into the specimen. The domain wall motion and localized power loss of the specimens were then remeasured and hence the effect of the introduction of pinning points assessed. The experimental results show that an increase in power loss occurs due to the introduction of the pinning points and this increase is qualitatively dependent upon the change in the domain wall motion; but as yet a direct quantitative correlation has not been achieved due to the difficulty in defining a satisfactory criterion of wall pinning. The experimental results to be presented also show marked differences between the behaviour of commercial material and single crystals when subjected to the introduction of pinning points.

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